At present, highways are being built on a large scale in China. The Ministry of Communications and local road transport management departments hope that video monitoring can cover all sections. However, due to the time-consuming and labor-intensive construction excavation and pole erection on the highway, higher requirements are put forward for the photographic coverage distance, width, resolution of the photographic image and image transmission speed of a single camera.

In addition, at night and in harsh weather conditions, the wavelength of visible light is short, the ability to overcome obstacles is poor, and the observation effect is poor. At this time, the sensor system is required to perform the road monitoring task, which puts forward higher requirements for the stability, accuracy, and timeliness of the sensor.