Which system is typically used by law enforcement for speed detection?

The Lidar system is considered an effective tool for speed detection because it utilizes a method called light detection and ranging to measure distances with high precision. By emitting a rapid series of laser pulses towards a vehicle, Lidar can determine both the distance and speed of the moving object based on the time it takes for the light to return to the sensor. This technology provides law enforcement officers with accurate and reliable readings, particularly in various conditions including bright sunlight and high traffic situations. The ability to measure speed at a very fine resolution makes Lidar a preferred choice for speed enforcement in many jurisdictions.

While radar systems are also commonly used for speed detection, Lidar's accuracy and ability to target specific vehicles make it stand out in law enforcement contexts. Option A, the sonar system, is generally related to underwater distance measurements and is not typically used in speed detection. Option D, GPS tracking, may provide data on vehicle speeds but does not measure speed in real-time in the same direct manner as Lidar.