Abstract: The present invention demonstrates that light-emitting diodes (LEDs) have electrical characteristics that can be used to dramatically reduce the complexity and cost of the traffic signaling equipment needed to control the array of signals to give the right of way to the vehicles in a given intersection. This also enhances the energy saving features of LEDs by relocating the power source to the traffic signal control system and the electric conditioning devices to the signal position, increasing the energy efficiency of the whole intersection. One benefit is “intrinsic safety” based on a method for power distribution to the signals that does not allow failure modes that could cause accidents. The system ensures that simultaneous green or yellow signals on crossed streets are impossible even though the signals are connected to the same power lines, allowing also the use of a bus connection topology with a command driven control of the ON/OFF state for each individual light or signal.

Abstract: A Local Controller device installed in or on the fuel pump capable of functioning as a pump controller dedicated solely to the pump in which it is installed and as a data router to and from the peripheral devices. This dedicated Local Controller device contains a microcomputer with a pump communications interface and optionally a remote, Site Controller communication interface which is non-dedicated and has control over many pumps at the station. If connected to such a Site Controller, the device will function as a slave to this Site Controller. Otherwise it functions autonomously to control the pump on its own.