Micro Pin

Project: micro controller based automatic four way traffic control?

I am given a project of "micro controller based automatic four way traffic control"

I have no idea where to start it. Can you please guide me about it's diagram and program code?
What are the reqirements for it's hard ware completion ?

I have just one week to submit this project.
I shall be very thank full to you.

for the bare minimum, you need six on/off outputs: green, yellow, red for the "main" street A and the same for a cross street B. you will need to track time so you can sequence the lights as required. you can connect green, yellow red LEDs directly to the micro pins.
one set of LEDs can cover both directions of the street; cars facing each other get the same colors.

define your basic cycle as: greenA-redB, yellowA-redB, red both ways
(the dead time), redA-greenB, redA-yellowB, red both ways. state times can be 26 seconds where there is a green on, 2 seconds otherwise.
over all repeat time is one minute.

if you want more... add support for a green left-turn arrow in or both directions. two more on-off outputs, a somewht more complex

still more? add in support to vary the cycle based on the presence or absence of a car waiting at one or more of the four possible places.
this is one to 4 additional on/off inputs.

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