ETC lane vehicle detection system and detection method

The invention relates to an ETC lane vehicle detection system and a detection method. The ETC lane vehicle detection system comprises a lane host, a fixing rack positioned on an ETC lane, and a laser scanning sensor and a license plate identification device electrically connected with the lane host, the laser scanning sensor and the license plate identification device are both fixed on the fixing rack, the laser scanning sensor is provided with a first laser port and a second laser port, the first laser port and the second laser port are both arranged face to the ETC lane, and the first laser port and the second laser port are arranged along the length direction of the ETC lane. According to the ETC lane vehicle detection system and the detection method, the reconstruction of the three-dimensional contour of the vehicle is realized via the laser scanning sensor, the license plate identification device, and a lane controller, accurate model identification is realized, even a large vehicle installs an OBU of a small vehicle, the large vehicle cannot pass since vehicle information is not in accordance with OBU information, fee evasion behaviors of the vehicles on the ETC lanes can be prevented, the benefit of highway owners is maintained, and the order of the traffic transportation market is maintained.