Four Way Traffic Light Controlling Circuit Design using Proteus Software

----Four Way Traffic Light Controlling Circuit---
The four-way traffic light circuit consists of two stages. The first one is the timing and counting stages. The other one is an indication of the light stage. The indication of the light stage should be properly placed on four lanes. The values of the capacitor and the resistor set the timing of the 555 IC. It then delivers them at the output pin. These pulses decide the timing interval of traffic light signals.

[@aszalma3908]

Can u tell me which part is doing what?