# Colour vision (recognition of traffic signal colours) — Medical conditions that disqualify a commercial driver under 49 CFR 391.41

For Colour vision (recognition of traffic signal colours), standard, as the regulation states it is the ability to recognize the colors of traffic signals and devices showing standard red, green, and amber; paragraph is (b)(10)(i); regulation section is 49 CFR 391.41, recorded from its source on 2026-08-31; source re-checked 2026-09-15.

- **Disqualifying condition or standard:** Colour vision (recognition of traffic signal colours) _(our reading, not quoted from the source)_
- **Standard, as the regulation states it:** the ability to recognize the colors of traffic signals and devices showing standard red, green, and amber _(verified: appears in the quote below)_
- **Paragraph:** (b)(10)(i) _(our reading, not quoted from the source)_
- **Regulation section:** 49 CFR 391.41

## What the source says

> (10) (i) Has distant visual acuity of at least 20/40 (Snellen) in each eye without corrective lenses or visual acuity separately corrected to 20/40 (Snellen) or better with corrective lenses, distant binocular acuity of at least 20/40 (Snellen) in both eyes with or without corrective lenses, field of vision of at least 70° in the horizontal meridian in each eye, and the ability to recognize the colors of traffic signals and devices showing standard red, green, and amber; or

## Source

- https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-391/subpart-E/section-391.41

Last verified: 2026-09-15. Review by: 2027-08-31.
Part of [Medical conditions that disqualify a commercial driver under 49 CFR 391.41](https://referencesource.org/dot-cdl-medical-disqualifying-conditions/).