Why don't traffic lights in the US have a second counter?
in the us, almost all traffic lights do not have a second counter. if the light is still green, traffic participants can comfortably continue to drive. the light will know that
Tags : traffic lights
10 smart designs help the Government control people's actions every day
here are 10 smart designs around the world that help the government control people's actions every day and our city more comfortable. invite you to consult!