The lighting system of a motor vehicle consists of lighting and signalling devices mounted on the front, rear, sides, and in some cases on the top of a motor vehicle, and lights the roadway for the driver. The lighting system also makes the vehicle more visible, especially in low light conditions. It gives warning to other drivers and pedestrians of a vehicle's presence and direction of travel. Emergency vehicles usually carry distinctive lighting equipment to alert drivers and pedestrians of their rapid movement during an emergency.