Driving with Color Vision Deficiency: Regulations and Safety Strategies

Legal Landscape

• Most jurisdictions: Do not ban color-blind drivers outright.
• Some require: Additional testing (e.g., Farnsworth D-15, lantern test) or restriction to daylight hours.
• Commercial licenses (CDL): Stricter standards (e.g., FMCSA in US requires passing color vision test or waiver).

Functional Challenges

• Red-green confusion: traffic signals, brake lights vs. turn signals.
• Low light: color discrimination further degrades.
• Weather: rain/fog reduces contrast.

Compensatory Strategies

1. Learn signal position: Red top/left, green bottom/right (vertical/horizontal).
2. Use shape cues: Some countries use distinct shapes (e.g., square red, triangle yellow).
3. Increase following distance for earlier brake-light detection.
4. Avoid night driving if severely impaired.
5. Specialized lenses (e.g., EnChroma) may help some—but not a legal cure.

Regular ophthalmic review ensures stable status and updates on regulatory changes.