This circuit is a simple traffic light, composed of IC 4017 and IC 555
The speed can change by P1
you can add more LEDs for each color
Parts list:
IC 4017
IC 555
Diode 1N4007 (9pcs)
Potentiometer 1M
LEDs(12pcs for each color)
Capacitor 10uF 25v
Resistor 100k