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can i use a 7-segment display to show the time remaining for the signal to change??....if yes then how??

are u willing to use a microcontroller or not?

You can do it with a 7447 and a 7490(TTL gates and not a microcontroller) THERE ARE SITES WITH SCHEMATICS TO DO THIS!!!

no not a microcontroller.....

year this is a great circuit also posted at http://www.kpsec.freeuk.com/projects/trafficlight.htm
thanks for making an instructable about it as it was hard to read

u r correct but now i have to redesign the circuit

justswitch the red and green LEDs

it's purpose is to get ready!...by the way nice project rohit!..