A clock pulse of 10 seconds period is used to clock a 3 bit binary counter. This counter counts from 0 to 7. The outputs of the three bistables are used as inputs of a combinational logic that controls the sequence of the traffic lights. GREEN is ON for 30 sec. Amber is ON for 10 sec RED is ON for 30 sec AMBER and RED is on for 10 sec. and so on. (ON- Logic 1) Degisn the circuit bu using D flip flops and 12H6 PAL