What color may pedestrian signs be?

Pedestrian signs are specifically designed for high visibility and to convey important information to both drivers and pedestrians. The correct choice—fluorescent yellow-green or standard yellow—is effective in capturing attention quickly. Fluorescent yellow-green, in particular, has been shown to be one of the most effective colors for increasing visibility, especially in situations where pedestrians might be crossing roads. This color is often used for school zones and pedestrian warning signs, as it alerts drivers to the presence of pedestrians and the need for caution.

The other color options do not serve the same high-visibility purpose in the context of pedestrian safety. For instance, standard white or black may not be as effective in drawing attention in a traffic setting, while red typically signifies emergency or stop signals rather than pedestrian movement. Dark blue, although it can be visible at night, is not commonly used for pedestrian signs and may not provide the necessary alertness to drivers during the day. Thus, fluorescent yellow-green or standard yellow is the most appropriate choice for pedestrian signs, maximizing safety and awareness on the roads.