{"asset": "dot-hazmat-placarding-thresholds", "asset_type": "threshold", "body": "A shipment of hazardous material must be placarded on the transport vehicle, and which placard applies -- and whether it is required at any quantity or only once the aggregate gross weight of that class crosses 1,001 lb (454 kg) -- is fixed by two tables in one regulation, 49 CFR 172.504(e). Table 1's eight categories (explosives 1.1-1.3, poison gas, dangerous-when-wet, temperature-controlled organic peroxide, poison-inhalation-hazard, radioactive) require the named placard regardless of quantity. Table 2's fifteen require it only above 1,001 lb -- but that exception is a highway/rail exception that does not reach bulk packagings, which need a placard at any quantity, so every record carries the general rule and the exception's own scope alongside the number. Each record is one hazard-class / placard pairing. Answers 'do I need to placard this shipment', 'how much of this hazard class triggers a placard', 'which placard goes with hazard class 5.1'.\n", "description": "A shipment of hazardous material must be placarded on the transport vehicle, and which placard applies -- and whether it is required at any quantity or only once the aggregate gross weight of that class crosses 1,001 lb (454 kg) -- is fixed by two tables in one regulation, 49 CFR 172.504(e). Table 1's eight categories (explosives 1.1-1.3, poison gas, dangerous-when-wet, temperature-controlled organic peroxide, poison-inhalation-hazard, radioactive) require the named placard regardless of quantity. Table 2's fifteen require it only above 1,001 lb -- but that exception is a highway/rail exception that does not reach bulk packagings, which need a placard at any quantity, so every record carries the general rule and the exception's own scope alongside the number. Each record is one hazard-class / placard pairing. Answers 'do I need to placard this shipment', 'how much of this hazard class triggers a placard', 'which placard goes with hazard class 5.1'.", "file": "index.md", "generated": true, "harvested": "2026-08-19", "key_field": "category", "licence": "US federal regulation \u2014 17 USC 105, no copyright", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "dataset", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.1\n\n**Hazard class or division:** 1.1\n\n**Placard name:** EXPLOSIVES 1.1\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.522\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 1.1 | EXPLOSIVES 1.1 | 172.522\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.1", "file": "1-1.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.1", "id": "1-1", "placard_design_section": "172.522", "placard_name": "EXPLOSIVES 1.1", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.1 | EXPLOSIVES 1.1 | 172.522", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "1.1 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.2\n\n**Hazard class or division:** 1.2\n\n**Placard name:** EXPLOSIVES 1.2\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.522\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 1.2 | EXPLOSIVES 1.2 | 172.522\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.2", "file": "1-2.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.2", "id": "1-2", "placard_design_section": "172.522", "placard_name": "EXPLOSIVES 1.2", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.2 | EXPLOSIVES 1.2 | 172.522", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "1.2 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.3\n\n**Hazard class or division:** 1.3\n\n**Placard name:** EXPLOSIVES 1.3\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.522\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 1.3 | EXPLOSIVES 1.3 | 172.522\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.3", "file": "1-3.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.3", "id": "1-3", "placard_design_section": "172.522", "placard_name": "EXPLOSIVES 1.3", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.3 | EXPLOSIVES 1.3 | 172.522", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "1.3 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.4\n\n**Hazard class or division:** 1.4\n\n**Placard name:** EXPLOSIVES 1.4\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.523\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 1.4 | EXPLOSIVES 1.4 | 172.523\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.4", "file": "1-4.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.4", "id": "1-4", "placard_design_section": "172.523", "placard_name": "EXPLOSIVES 1.4", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.4 | EXPLOSIVES 1.4 | 172.523", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "1.4 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.5\n\n**Hazard class or division:** 1.5\n\n**Placard name:** EXPLOSIVES 1.5\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.524\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 1.5 | EXPLOSIVES 1.5 | 172.524\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.5", "file": "1-5.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.5", "id": "1-5", "placard_design_section": "172.524", "placard_name": "EXPLOSIVES 1.5", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.5 | EXPLOSIVES 1.5 | 172.524", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "1.5 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 1.6\n\n**Hazard class or division:** 1.6\n\n**Placard name:** EXPLOSIVES 1.6\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.525\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 1.6 | EXPLOSIVES 1.6 | 172.525\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "1.6", "file": "1-6.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "1.6", "id": "1-6", "placard_design_section": "172.525", "placard_name": "EXPLOSIVES 1.6", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "1.6 | EXPLOSIVES 1.6 | 172.525", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "1.6 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 2.1\n\n**Hazard class or division:** 2.1\n\n**Placard name:** FLAMMABLE GAS\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.532\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 2.1 | FLAMMABLE GAS | 172.532\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "2.1", "file": "2-1.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "2.1", "id": "2-1", "placard_design_section": "172.532", "placard_name": "FLAMMABLE GAS", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "2.1 | FLAMMABLE GAS | 172.532", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "2.1 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 2.2\n\n**Hazard class or division:** 2.2\n\n**Placard name:** NON-FLAMMABLE GAS\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.528\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 2.2 | NON-FLAMMABLE GAS | 172.528\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "2.2", "file": "2-2.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "2.2", "id": "2-2", "placard_design_section": "172.528", "placard_name": "NON-FLAMMABLE GAS", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "2.2 | NON-FLAMMABLE GAS | 172.528", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "2.2 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 2.3\n\n**Hazard class or division:** 2.3\n\n**Placard name:** POISON GAS\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.540\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 2.3 | POISON GAS | 172.540\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "2.3", "file": "2-3.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "2.3", "id": "2-3", "placard_design_section": "172.540", "placard_name": "POISON GAS", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "2.3 | POISON GAS | 172.540", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "2.3 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 3\n\n**Hazard class or division:** 3\n\n**Placard name:** FLAMMABLE\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.542\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 3 | FLAMMABLE | 172.542\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "3", "file": "3.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "3", "id": "3", "placard_design_section": "172.542", "placard_name": "FLAMMABLE", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "3 | FLAMMABLE | 172.542", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "3 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 4.1\n\n**Hazard class or division:** 4.1\n\n**Placard name:** FLAMMABLE SOLID\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.546\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 4.1 | FLAMMABLE SOLID | 172.546\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "4.1", "file": "4-1.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "4.1", "id": "4-1", "placard_design_section": "172.546", "placard_name": "FLAMMABLE SOLID", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "4.1 | FLAMMABLE SOLID | 172.546", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "4.1 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 4.2\n\n**Hazard class or division:** 4.2\n\n**Placard name:** SPONTANEOUSLY COMBUSTIBLE\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.547\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 4.2 | SPONTANEOUSLY COMBUSTIBLE | 172.547\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "4.2", "file": "4-2.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "4.2", "id": "4-2", "placard_design_section": "172.547", "placard_name": "SPONTANEOUSLY COMBUSTIBLE", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "4.2 | SPONTANEOUSLY COMBUSTIBLE | 172.547", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "4.2 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 4.3\n\n**Hazard class or division:** 4.3\n\n**Placard name:** DANGEROUS WHEN WET\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.548\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 4.3 | DANGEROUS WHEN WET | 172.548\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "4.3", "file": "4-3.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "4.3", "id": "4-3", "placard_design_section": "172.548", "placard_name": "DANGEROUS WHEN WET", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "4.3 | DANGEROUS WHEN WET | 172.548", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "4.3 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 5.1\n\n**Hazard class or division:** 5.1\n\n**Placard name:** OXIDIZER\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.550\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 5.1 | OXIDIZER | 172.550\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "5.1", "file": "5-1.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "5.1", "id": "5-1", "placard_design_section": "172.550", "placard_name": "OXIDIZER", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "5.1 | OXIDIZER | 172.550", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "5.1 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 5.2 \u2014 Organic peroxide, Type B, liquid or solid, temperature\n\n**Hazard class or division:** 5.2\n\n**Additional description:** Organic peroxide, Type B, liquid or solid, temperature controlled\n\n**Placard name:** ORGANIC PEROXIDE\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.552\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 5.2 (Organic peroxide, Type B, liquid or solid, temperature controlled) | ORGANIC PEROXIDE | 172.552\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "5.2 \u2014 Organic peroxide, Type B, liquid or solid, temperature", "class_qualifier": "Organic peroxide, Type B, liquid or solid, temperature controlled", "file": "5-2-organic-peroxide-type-b-liquid-or-solid-temperature.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "5.2", "id": "5-2-organic-peroxide-type-b-liquid-or-solid-temperature", "placard_design_section": "172.552", "placard_name": "ORGANIC PEROXIDE", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "5.2 (Organic peroxide, Type B, liquid or solid, temperature controlled) | ORGANIC PEROXIDE | 172.552", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "5.2 \u2014 Organic peroxide, Type B, liquid or solid, temperature \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 5.2 \u2014 Other than organic peroxide, Type B, liquid or solid\n\n**Hazard class or division:** 5.2\n\n**Additional description:** Other than organic peroxide, Type B, liquid or solid, temperature controlled\n\n**Placard name:** ORGANIC PEROXIDE\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.552\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 5.2 (Other than organic peroxide, Type B, liquid or solid, temperature controlled) | ORGANIC PEROXIDE | 172.552\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "5.2 \u2014 Other than organic peroxide, Type B, liquid or solid", "class_qualifier": "Other than organic peroxide, Type B, liquid or solid, temperature controlled", "file": "5-2-other-than-organic-peroxide-type-b-liquid-or-solid.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "5.2", "id": "5-2-other-than-organic-peroxide-type-b-liquid-or-solid", "placard_design_section": "172.552", "placard_name": "ORGANIC PEROXIDE", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "5.2 (Other than organic peroxide, Type B, liquid or solid, temperature controlled) | ORGANIC PEROXIDE | 172.552", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "5.2 \u2014 Other than organic peroxide, Type B, liquid or solid \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 6.1 \u2014 material poisonous by\n\n**Hazard class or division:** 6.1\n\n**Additional description:** material poisonous by inhalation\n\n**Placard name:** POISON INHALATION HAZARD\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.555\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 6.1 (material poisonous by inhalation (see <https://www.ecfr.gov/current/title-49/section-171.8> \u00a7 171.8 of this subchapter )) | POISON INHALATION HAZARD | 172.555\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "6.1 \u2014 material poisonous by", "class_qualifier": "material poisonous by inhalation", "file": "6-1-material-poisonous-by.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "6.1", "id": "6-1-material-poisonous-by", "placard_design_section": "172.555", "placard_name": "POISON INHALATION HAZARD", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "6.1 (material poisonous by inhalation (see <https://www.ecfr.gov/current/title-49/section-171.8> \u00a7 171.8 of this subchapter )) | POISON INHALATION HAZARD | 172.555", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "6.1 \u2014 material poisonous by \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 6.1 \u2014 other than material poisonous by\n\n**Hazard class or division:** 6.1\n\n**Additional description:** other than material poisonous by inhalation\n\n**Placard name:** POISON\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.554\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 6.1 (other than material poisonous by inhalation) | POISON | 172.554\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "6.1 \u2014 other than material poisonous by", "class_qualifier": "other than material poisonous by inhalation", "file": "6-1-other-than-material-poisonous-by.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "6.1", "id": "6-1-other-than-material-poisonous-by", "placard_design_section": "172.554", "placard_name": "POISON", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "6.1 (other than material poisonous by inhalation) | POISON | 172.554", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "6.1 \u2014 other than material poisonous by \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 6.2\n\n**Hazard class or division:** 6.2\n\n**Placard name:** NONE\n\n**Placarding threshold:** no placard specified for this class\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 6.2 | NONE |\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "6.2", "file": "6-2.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "6.2", "id": "6-2", "placard_name": "NONE", "placarding_threshold": "no placard specified for this class", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "6.2 | NONE |", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "6.2 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 7\n\n**Hazard class or division:** 7\n\n**Additional description:** Radioactive Yellow III label only\n\n**Placard name:** RADIOACTIVE\n\n**Placarding threshold:** any quantity\n\n**Placard design regulation:** 172.556\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n> 7 (Radioactive Yellow III label only) | RADIOACTIVE 1 | 172.556\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "7", "class_qualifier": "Radioactive Yellow III label only", "file": "7.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "7", "id": "7", "placard_design_section": "172.556", "placard_name": "RADIOACTIVE", "placarding_threshold": "any quantity", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "7 (Radioactive Yellow III label only) | RADIOACTIVE 1 | 172.556", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "title": "7 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 8\n\n**Hazard class or division:** 8\n\n**Placard name:** CORROSIVE\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.558\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 8 | CORROSIVE | 172.558\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "8", "file": "8.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "8", "id": "8", "placard_design_section": "172.558", "placard_name": "CORROSIVE", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "8 | CORROSIVE | 172.558", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "8 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** 9\n\n**Hazard class or division:** 9\n\n**Placard name:** CLASS 9\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.560\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> 9 | CLASS 9 (see <https://www.ecfr.gov/current/title-49/section-172.504#p-172.504(f)(9)> \u00a7 172.504(f)(9) ) | 172.560\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "9", "file": "9.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "9", "id": "9", "placard_design_section": "172.560", "placard_name": "CLASS 9", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "9 | CLASS 9 (see <https://www.ecfr.gov/current/title-49/section-172.504#p-172.504(f)(9)> \u00a7 172.504(f)(9) ) | 172.560", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "9 \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}
{"asset": "dot-hazmat-placarding-thresholds", "body": "**Category of material:** Combustible liquid\n\n**Hazard class or division:** Combustible liquid\n\n**Placard name:** COMBUSTIBLE\n\n**Placarding threshold:** 1,001 lb (454 kg) aggregate gross weight\n\n**Placard design regulation:** 172.544\n\n**Regulation:** \u00a7 172.504 General placarding requirements.\n\n**General rule (172.504(a)):** Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section\n\n**Scope of the 1,001 lb exception:** when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required\n\n**The 1,001 lb figure:** A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2\n\n> Combustible liquid | COMBUSTIBLE | 172.544\n\nSource: <https://www.ecfr.gov/current/title-49/section-172.504>\n", "category": "Combustible liquid", "file": "combustible-liquid.md", "general_placarding_rule": "Except as otherwise provided in this subchapter, each bulk packaging, freight container, unit load device, transport vehicle or rail car containing any quantity of a hazardous material must be placarded on each side and each end with the type of placards specified in tables 1 and 2 of this section", "generated": true, "harvested": "2026-08-19", "hazard_class": "Combustible liquid", "id": "combustible-liquid", "placard_design_section": "172.544", "placard_name": "COMBUSTIBLE", "placarding_threshold": "1,001 lb (454 kg) aggregate gross weight", "regulation": "\u00a7 172.504 General placarding requirements.", "source_quote": "Combustible liquid | COMBUSTIBLE | 172.544", "sources": ["https://www.ecfr.gov/current/title-49/section-172.504"], "stale_after": "2027-02-15", "threshold_exception_scope": "when hazardous materials covered by table 2 of this section are transported by highway or rail, placards are not required", "threshold_quantity_rule": "A transport vehicle or freight container which contains less than 454 kg (1001 pounds) aggregate gross weight of hazardous materials covered by table 2", "title": "Combustible liquid \u2014 DOT hazmat placarding requirements by hazard class (any-quantity vs. 1,001 lb threshold)", "type": "threshold", "verified": false}