Yes, color blind people can drive in most countries, including the United States. The vast majority of U.S. states have no color vision requirement at all for a standard driver’s license. Millions of people with color vision deficiency drive every day, relying on the standardized position of traffic lights rather than the colors themselves.
U.S. Laws on Color Vision and Driving
Most U.S. states do not test color vision when you apply for a driver’s license. Massachusetts is a notable exception, requiring drivers to distinguish red, green, and amber. If you can’t pass that test, the state will not issue a license. A handful of other states have similar requirements, but they are the minority.
Commercial driving is a different story. The Federal Motor Carrier Safety Administration requires anyone operating a commercial motor vehicle to recognize the colors of traffic signals and devices showing standard red, green, and amber. This means that if you want a commercial license to drive a semi-truck or bus, you will need to pass a color vision screening regardless of what state you’re in.
How Color Blind Drivers Read Traffic Lights
The reason most color blind drivers get along fine is that traffic signals follow a strict, universal layout. Federal standards from the Federal Highway Administration dictate that on a vertical signal, red is always on top, yellow in the middle, and green on the bottom. On horizontal signals, red is always on the far left, yellow in the center, and green on the right. Once you know this order, you can identify which light is active by its position, not its color.
Some regions have also made the lights themselves easier to distinguish. Many newer traffic signals use a bluish-green LED rather than a pure green, which creates more contrast for people with red-green color blindness. Japan went further in 1973, officially shifting its “green” traffic lights to a distinctly blue hue. Designers have also proposed shape-based signals, using triangles for stop, circles for caution, and squares for go, though these haven’t been widely adopted.
Where Color Blindness Can Restrict Driving
Several countries are stricter than the U.S. Cambodia, Indonesia, and Laos exclude drivers who show any color vision impairment on the Ishihara plate test, the familiar book of dotted-number images used by eye doctors. Taiwan also requires all drivers to distinguish red, yellow, and green. Singapore and Brunei take a more practical approach, testing whether applicants can tell the three signal colors apart at a distance of 23 meters rather than relying on a clinical plate test.
Other countries split the difference by restricting only professional drivers. Malaysia and Myanmar apply color vision screening to commercial license holders but allow personal driving with any level of color deficiency. Poland follows a similar model, requiring color discrimination only for commercial drivers.
Do Color Blind Drivers Have More Accidents?
This is where the picture gets complicated. Traffic authorities in most countries have long operated on the assumption that color blindness poses no serious safety problem for everyday driving. But a review of available evidence, published in a study titled “Color defective drivers and safety,” pushed back on that conclusion, finding that accident data, driver testimonials, and controlled studies all suggest some measurable risk. The disconnect likely comes from the fact that most color blind drivers compensate effectively through position cues, but certain situations, like a single flashing red or yellow light at night, a signal partially hidden by tree branches, or brake lights in fog, can be harder to interpret without reliable color perception.
The practical risk varies enormously depending on severity. Red-green color blindness exists on a spectrum. Someone with a mild deficiency may barely notice it in daily life, while someone with a severe form may genuinely struggle to tell a red light from a yellow one at certain times of day. Complete color blindness, where everything appears in shades of gray, is extremely rare and presents a more significant challenge, though even those drivers can rely on light position.
Color-Correcting Glasses and Driving
Glasses marketed for color blindness, such as those made by EnChroma, work by filtering certain wavelengths of light so that red and green don’t overlap as much in your visual system. For people with milder red-green deficiency, they can genuinely improve contrast between colors that otherwise look similar.
However, there’s a catch for driving. Because these glasses block some incoming light to achieve their filtering effect, they can reduce night vision. EnChroma itself warns against wearing their glasses while driving. They are not a workaround for passing a color vision test, and no U.S. state currently recognizes them as a corrective device the way standard prescription glasses are recognized for visual acuity.
Practical Tips for Color Blind Drivers
If you’re color blind and drive regularly, the most important habit is memorizing the standard light positions: top or left is always red, bottom or right is always green. At intersections with a single flashing light, pay close attention to context. A flashing light at the top position of a signal means stop; one at the bottom means proceed with caution.
Watch the behavior of other cars at unfamiliar intersections. If everyone ahead of you is stopping, the light is almost certainly red regardless of what color you perceive. Be especially cautious with temporary or construction signals, which may not follow the standard layout. And if you’re planning to get a commercial license, get your color vision tested early so you know where you stand before investing time in CDL training.