Abstract: An automated bidirectional sequenced flashing light system is disclosed for the purpose of controlling traffic direction on airport runways and the like. It includes a mastercontrol containing integrated logic circuit and solid state switching circuits, an opto-electronic wind direction sensor and a set of ten or more light assemblies placed midrunways and along runways for a short distance and a pair of same assemblies placed on each runway end or threshold. Integrated circuit components decode signals from sensor and establish direction of flashes and integrated gating provide signals for flashing of the corresponding pair of endlights. A balanced resistor capacitor network is used for crosswind delay.