What colors may traffic signals display?

Traffic signals are designed to convey specific instructions regarding the operation of vehicles and pedestrians at intersections. The primary colors displayed on standard traffic signals are red, amber (often referred to as yellow), and green.

Red indicates that vehicles must stop and prohibits any movement in the direction of the signal. This is a crucial safety measure to prevent collisions at intersections. Amber serves as a warning that the light is about to change to red, and it instructs drivers to prepare to stop if it is safe to do so. Green signals that it is safe for vehicles to proceed through the intersection.

The other color choices presented, such as blue, white, and purple, are not traditionally used in traffic signal systems to indicate traffic control directions. Understanding the purpose and meaning of these specific colors in traffic signals is essential for safe driving and adherence to traffic laws. Thus, the correct colors that may display on traffic signals are red, amber, or yellow.