The load detection system is built at the entrance of the expressway. When the load truck passes the dynamic weighing bridge, the weighing load cell and electronic scale will check and judge by themselves and give signals to control the traffic signal. We can see if the vehicle is overweight and consider whether to use the highway. This kind of weighing modules applied on the highway requires a large range, the accuracy requirement is not particularly high, but the long-term stability must be good. With the development of load cells and other electronic devices, it will become more intelligent to allow unmanned control to block the passage of overweight vehicles, and to allow vehicles to be charged by weight.