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This paper describes the key methodology in the design of a novel computational algorithm for traffic signal control in an oversaturated traffic network. The system is integrated with a computational traffic control algorithm and a system on chip (SoC) traffic controller. Traditional traffic network algorithms need many vehicle detectors and a high performance computer system for its complex optimal algorithm. The novel algorithm only needs critical approach detector's information and is simple enough to put into a SoC system which has fewer computing resource. Comparing to full actuated traffic controller, the simulation shows that this system has better traffic performance index, works on less resource system and needs fewer vehicle detectors.