由日本土木研究所于1979年研制并于1981年改进可对车型分类的车辆感知器,是由超声波车辆感知器和环线电感车辆感知器组合而成的。它用超声波检测车辆高度,用超声波和环线电感检测车辆长度,用环线电感装置检测车厢底的高度。这种车辆感知器可用以对交通流中的大型货车、小型货车、 Developed by the Japan Civil Engineering Institute in 1979 and improved in 1981 to classify vehicle sensors, this is a combination of an ultrasonic vehicle sensor and a loop inductance vehicle sensor. It uses ultrasonic detection of vehicle height, with ultrasonic and loop inductance to detect the length of the vehicle, with loop inductance device to detect the height of the bottom. This kind of vehicle sensor can be used to monitor the flow of large trucks, minivans,