What color is required for side marker lights on vehicles?

The correct answer is that side marker lights on vehicles are required to be amber. Amber lights are used specifically for side markers to enhance visibility and indicate the vehicle's presence, especially during low-light conditions. This color coding helps other drivers understand the vehicle's position and orientation on the road.

In addition to safety, using amber for side marker lights is standardized across various jurisdictions, adhering to regulations that specify light colors for different vehicle lighting functions. For example, red is typically reserved for rear lights, including brake lights and tail lights, while white lights are generally used for headlights and license plate illumination. Green lights are not standard for any automotive lighting function, making amber the appropriate choice for side markers.