Do they still teach about FLOW CHARTS at school?
Sit down and imagine you are at the lights (even better go look at one) and look at the sequence, then put it down as a flow chart.
It is what they use to do when i was taught digital (long time ago and we had to build the computer from a kit).
Saying you have this led and that led is not instructive, better to say i have 3 sets of lights on a strip of road traffic goes in one direction only and one of the light is a pedestrian set.
The lights consist of a pole on each side of the road with the following, red on top, green on bottom and amber in the middle.
Then go on to explain what will be the sequence of events when.
A. A car approaches.
B. A car approaches but a pedestrian pushes the button to cross.
C. Its a cross road and two cars approach.
I realize you are at school but surely they let you out in the real world once in a while?
Daz
P.s. from the above you can see how others can begin to help you i hope.