The efficiency of piezoelectric box of energy collection cannot meet the needs of large-scale power requirements, in practical aspects may be more suitable to apply to traffic facilities, such as traffic indicates brand, reminding on cars in the opposite direction, its advantages is no need of far distance power, traffic facilities can power themselves, and it can adjust its working time according to the vehicle density on the roads, energy-saving aim can be achieved; piezoelectric devices can also be used to get traffic information, such as the load and driving speed of vehicles and deliver real-time data to the traffic control system database, which can provide reliable information for road transportation research studies.