Buses shall be equipped with a system consisting of four red flashing warning lights and four amber flashing warning lights. Shields are required over the warning lights except those equipped by the manufacturer with halogen or L.E.D. (Light Emitting Diodes). The shields may be of a single type to cover both the red and amber lights and shall be painted black, with a minimum depth of 4 inches. There shall be a red and amber pilot light which shall go on when the respective amber or red systems are actuated. The appropriate pilots shall either go out or flash at an obvious altered rate if any of the lights in the system are not functioning normally. The warning light switches and red and amber pilot lights shall be mounted to the right of the seated driver within easy unobstructed reach, in a panel or a specific area in the dash, and not incorporated with other switches. The signal lamp system shall operate as follows: With master switch on and entrance door closed, depress momentary switch. Amber pilot light and amber flashing lights shall go on. Open entrance door. Amber pilot light and amber flashing lights shall go off and red pilot light and red flashing lights shall go on. Stop arm shall automatically extend. Close entrance door. Red pilot and flashing lights shall go off, and the stop arm shall retract immediately. Open entrance door without depressing momentary switch. Red pilot light and red flashing lights shall go on. Stop arm shall automatically extend. With master switch off, depressing momentary switch may not activate the amber flashing system, nor will opening entrance door activate the red flashing signal and stop arm. An override switch shall be provided which permits the activation of the red warning lights and red pilot light without opening the service door. The red override system shall operate when the master switch is in both the on and off positions. Installation Requirements. Each flashing light shall be mounted with its axis substantially parallel to the longitudinal axis of vehicle. Front and rear alternately flashing lights shall be spaced as far apart laterally as practicable. Alternately flashing lights shall be mounted at the front above the windshield and at the rear so that the lower edge of lens is not lower than top line of the side window. Vertical and lateral vision of the front and rear alternately flashing warning lights may not be obstructed by any part of the body or lamphouse insofar as standard vehicle body construction permits. The area around each lamp, extending approximately 1 inch outward, shall be painted black. A separate fuse, circuit breaker, or field effect transistor, adequate to prevent damage to the system in the event of a dead short, shall be provided between the power source and the master switch.