Introduction - If you have any usage issues, please Google them yourself
a north-south and east-west direction at a group of green, yellow, red, green yellow and red respectively, the duration of 20 seconds, five seconds and 25 seconds, the controller to control the color of traffic lights in accordance with the traffic regulations for changes .. 2, 2, with two sets of digital controls to savers when shown two directions to allow or prohibit the passage of time; three, when there are special circumstances (such as fire engines and so on), in both directions were red lights, to stop the countdown, when special circumstances after the controller should return to the original state, to continue normal operations;