What is true about side markers in relation to headlamps and parking lamps?

The statement that side markers are illuminated whenever headlamps or parking lamps are illuminated is true because side marker lights serve as a visibility enhancement feature for vehicles. Their primary function is to indicate the presence and width of a vehicle, particularly in low-light conditions. When headlamps or parking lamps are activated, the side marker lights also turn on to improve the vehicle's visibility to others on the road.

This integration helps ensure that the vehicle is clearly seen from different angles, thus enhancing safety. The design promotes consistency in vehicle lighting, ensuring that as the primary lighting systems are enabled, secondary systems like the side markers align with them to increase overall visibility. Understanding this relationship is crucial for safety inspections, as functioning side markers are part of the overall requirements for vehicle lighting systems in many jurisdictions.