import time
from machine import Pin
Red = Pin(2, Pin.OUT)
Yellow = Pin(4, Pin.OUT)
Green = Pin(15, Pin.OUT)

while True:
    Red.value(1)        #Red
    Yellow.value(0)
    Green.value(0)
    time.sleep(2)
    
    Red.value(1)      #Red and Yellow
    Yellow.value(1)
    Green.value(0)
    time.sleep(2)

    Red.value(0)          #green
    Yellow.value(0)
    Green.value(1)
    time.sleep(3)

    Red.value(0)
    Yellow.value(0)
    Green.value(0)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(0)
    Green.value(1)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(0)
    Green.value(0)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(0)
    Green.value(1)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(0)
    Green.value(0)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(0)
    Green.value(1)
    time.sleep(0.5)

    Red.value(0)
    Yellow.value(1)
    Green.value(0)
    time.sleep(2)

    Red.value(1)
    Yellow.value(0)
    Green.value(0)
    time.sleep(2)