Introduction - If you have any usage issues, please Google them yourself
Traffic lights, traffic lights function to achieve, (2) what the red light 30 seconds (green light 30 seconds north and south) 3 red flashing things that 6 seconds (0.5 seconds off-0.5 seconds off) (north and south yellow light 6 seconds) 4 things green light is 30 seconds (red light 30 seconds north and south) 5 things yellow light for 6 seconds (north-south red flashing six seconds) ? (next cycle) 6, respectively, with six representatives of red, green and yellow light-emitting diodes 7. In the two digital countdown display