Abstract: A single-wire system for controlling electrical devices and multiple lights such as warning and signal lights for buses and other vehicles. The system includes a transmitter at a forward end of the vehicle and a receiver at the rear, a power supply and a signal lead. The transmitter operates in a "parallel in"-"serial out" mode and converts simultaneously-received input signals into a sequential or serial output format for transmission, on a single wire, to a "serial-in"-"parallel-out" receiver where the signals are decoded to provide rapid-pulse command data. These data bits are then directed to appropriate stations, including lamps, for energization thereof as warning and signal elements.

Abstract: A system of modifying existing light systems and for the installation of new lighting systems on school buses and similar vehicles so as simply to convert a conventional "four-light system," to a government-recommended "eight-light system," consisting of a red flashing hazard warning system including four red lights and four amber lights. The invention has particular utility in applications in which the installation of additional wiring is either inconvenient or impractical, since conversion may be effected with a minimum of disruption of existing "single wire" systems.