In the highway at the entrance to the construction of the load detection branch, when the loaded trucks drive through the dynamic weighing bridge, weighing sensors and electronic weighing that is to check their own judgment, and at the same time to give a signal to control the traffic lights. In this way, we will be able to know whether the vehicle is overweight, so as to consider whether to pass this vehicle. This application in the highway weighing sensor requirements range, precision requirements are not particularly high, but long-term stability must be good, with the development of sensors and other electronic equipment, will be more and more intelligent, so as to achieve unmanned control can prevent overweight vehicles through, but also vehicles can be charged by weight.