Why does the speed detection light flash twice when not speeding?

[SarahDella]

That is a camera installed by the traffic police department, which takes a photo of the driver of every vehicle. Below is relevant information: There are three methods of speed detection on China's highways: Fixed camera speed detection: This means that only vehicles passing through areas with installed cameras are monitored for speed. If speeding is detected, the vehicle will be photographed and recorded. Section speed detection: This involves setting up a row of cameras at both ends of a highway section to photograph all passing vehicles. The average speed of each vehicle over the section is calculated based on license plate recognition. If the speed exceeds the limit, it will be recorded. Mobile speed detection: This refers to traffic officers using mobile speed detection devices (typically vehicles equipped with such devices or handheld speed guns) to randomly test vehicles on both sides of the road.