L2 D B A Figure shows the intersection of a main highway with a secondary access road. Vehicle detection sensors are placed along lines C and D (main road) and lanes A and B (main road). These sensor outputs are LOW (0) when no vehicle is present and HIGH (1) when a vehicle is present. The intersection traffic light is to be controlled according to the following logie 1. The Ll and L2 traffic light will be green whenever lanes C or D are occupied. 2. C and D have priority. 3. The L3 and L4 traffic light will be green whenever lanes A or B are occupied .In addition, if two vehicles occur at the same time in lane A and B , and if there is just one vehicle in C or D lane, then L3 and L4 traffic light will be green. 4. The L1 and L2 light will be green when no vehicles are present. 5. The L1 and L2 light will be green when lanes A,B,C and D are occupied. 00 00

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