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well my task is to design a traffic light with a 7 segment display countdown timer, where green remains ON 59s to 0s, then yellow 5 to 0 and red 30 to 0. You think shift register is a better option for this?

So Im trying to make a 4 bit down counter based on the one from sample by changing q and ~q output pin destinations (see image) but there still seems to be some kind of problem. Output on the display shows numbers 22-20, 27-20, 0F, 2E,1E,0E,7E,6E and stops(see image). And ive deleted hour, minute ...

Hello everyone
Is there any samples for timer circuits? Im currently trying to build this traffic light system with a timer for each light and finding it a bit hard to do this. Would kindly appreciate the help