What color must the clearance lamps be on multipurpose passenger vehicles that are 80 inches or more in overall width?

Clearance lamps on multipurpose passenger vehicles that are 80 inches or more in overall width must be amber in color. The purpose of these lamps is to ensure that the width of the vehicle is visible to other drivers, particularly in low light conditions, and amber is the standard color designated for this function. This color is universally recognized for marking the sides of a vehicle and indicating its width, improving safety on the road.

In contrast, red is typically used for tail lights and stop signals, green is not a standard color for vehicle lighting, and blue is reserved for emergency vehicles. Therefore, amber is the correct choice as it adheres to established safety regulations and standards for vehicle lighting.