It's good. Jiaonan Wawu intersection monitoring is located in Qingdao, Shandong Province, and the monitoring is very accurate. The purpose of this monitoring record is mainly to record the traffic volume, the type of each car and even the situation inside the car. When necessary, the police uncle can retrieve these videos and photos to hunt down criminals and investigate cases. The other is illegal evidence collection. The first recording is to record the initial information, but it is illegal to flash several times in a row. For example, judging the violation of red light requires three pictures: before the vehicle passes the stop line; When the car crosses the stop line; The vehicle went on driving after crossing the stop line.