What color light must the headlamps of a motor vehicle display?

• A. Red or green
• B. White or amber
• C. Blue only
• D. Yellow only

Answer: (B)

The headlamps of a motor vehicle are required to display white or amber light. This requirement ensures that the vehicle is visible to other drivers and pedestrians, promoting safety on the road. White light is used for the primary headlamps, providing the necessary illumination for both the vehicle's driver and others on the road. Amber lights may be utilized for turn signals, indicating the direction in which a vehicle intends to move, thereby improving communication between drivers.

In contrast, red or green lights are generally associated with specific vehicle types or functions, such as emergency vehicles or specific types of signals, and are not meant for standard headlamp use. Blue lights are often reserved for law enforcement vehicles, while yellow lights serve particular functions, such as caution lights or signal lights, rather than regular headlamp illumination. Hence, the requirement for headlamps to emit white or amber light is crucial for ensuring clarity and safety on the road.