As viewed from the side, what classification of lights indicate the full-over-all length of a vehicle?

The correct classification of lights that indicate the full-over-all length of a vehicle, when viewed from the side, is side marker lights. These lights are typically placed on the sides of larger vehicles, including trucks and trailers, to enhance visibility and provide clear indications of the vehicle's overall dimensions. Side marker lights serve the crucial purpose of alerting other drivers about the presence and length of a vehicle, especially in low-visibility conditions or when the vehicle is parked on the side of the road.

In contrast, rear lights primarily indicate the presence of the vehicle from the back and do not provide information about its length from the side. License plate lights illuminate the registration plate and are not intended to indicate the vehicle's dimensions. Indicator lights (turn signals) are used to communicate the vehicle's intended movement, but they do not help other road users gauge the size or length of the vehicle. Therefore, side marker lights are essential for safety and clarity on the road regarding the full length of a vehicle.