Clearance lights mount to the perimeter of trucks to identify their size and warn other motorists of the clearance required when driving around these vehicles. They are used on the front and back of oversized vehicles to clearly identify their width and height.

Marker lights mount to the perimeter of a truck to illuminate the outer edges of its body and alert motorists to its overall length and driving direction on the road.

Directional lights mount to work vehicles to alert other motorists to move in a specific direction, or to indicate which side of the road they should stay on. They flash in a directional pattern or with arrow-shaped lights to clearly guide other vehicles away from work sites and hazards.