Based on the relative distribution of the three kinds of cones in the retina, which color of road sign would be most difficult to see from a distance?

Question

Quizplus · Accepted Answer

Blue light is perceived by the least number of cones in the retina, making it the most difficult color to see from a distance. Red and yellow are perceived by more cones and are easier to see from a distance, while white reflects all colors and is also easier to see.

Based on the Relative Distribution of the Three Kinds of Cones