Abstract: In order to ensure road safety of highways,the paper introduces a system based on ZigBee highway speed limitation.The system uses wireless sensor networks to detect the environment temperature,humidity,and inhalable particles matter concentration data near highways.The system uses wireless networking technology and embedded technology to achieve the highway speed limitation,Using Kalman filtering algorithm to do curve fitting for monitored environmental data for real-time display on monitoring interface of upper computer.Simulation shows that the system is running under excellent condition.The fitted data turn out an ultra enhancement in smooth and reliability.Initiative to achieve a vehicle speed control.