When people are driving behind the truck, there will be a great visual blind area, especially in the last few seconds of the green light, people cannot judge the change of the signal light, thus causing red rush. This design, using the existing mature technology, it skillfully moved the sky lights to the road, so that people can see the lights on the road within the normal driving distance with the car, so as to ensure traffic safety. Drivers can judge the passage time through intuitive digital information, and they can also get the message through the change of signal light density. Road LED technology has been widely used in reality, so this is a likely design.