from machine import Pin
import utime
led_red=machine.Pin(15,machine.Pin.OUT)
led_amber=machine.Pin(14,machine.Pin.OUT)
led_green=machine.Pin(13,machine.Pin.OUT)
while True:
    led_red.value(1)
    utime.sleep(5)
    led_amber.value(1)
    utime.sleep(2)
    led_red.value(0)
    led_amber.value(0)
    led_green.value(1)
    utime.sleep(5)
    led_green.value(0)
    led_amber.value(1)
    utime.sleep(5)
    led_amber.value(0)