In the paper, the DSRC/WAVE (Dedicated Short Range Communication/Wireless Access in Vehicular Environments) systems are applied to control the lamps along a street or highway so that the safety of driving and efficiency of power consumption can be addressed at the same time. It would consume a lot of energy if there are few mobile vehicles passing through the streetlamps in the late night and apply the minimum light needs for the safety of the vehicles. According to the standards of the DSRC/WAVE, the demonstration system uses WAVE short message protocol (WSMP) to send message from V2V or V2I. The system uses the information from GPS on OBU to measure and predict the current position and speed of the mobile vehicles and then controls the process of the streetlamps. In the paper, DSRC/WAVE devices are explored to achieve energy conservation and safety with the extensive covered range, high speed rate link and mobility. The system demonstrates an example to show the inherent advantages of combining communication techniques and control techniques in realizing a safer and more energy-efficient transportation environment.