Field test method and standard instruments for verification of traffic speed meters based on test vehicle

Traffic speed enforcement is an important issue to guarantee public road security and to reduce the number of traffic accidents. Traffic speed meters are important legal measuring instruments specially used for traffic speed surveillance and enforcement in China and around the world. A field test method based on test vehicle is introduced in this paper. Firstly, the principle of the field test method based on test vehicle and the requirements for the standard speed-measuring instrument are introduced. Secondly, three main speed-measuring sensors, including non-contact optical speed sensor, GPS speed sensor and dual-antenna Doppler radar sensor, used in the standard speed-measuring instrument are given. Finally, two comparison experiments were carried out in the field to evaluate the field speed-measuring performances of the standard speed-measuring instruments with different speed sensors.