How to View Speeding on Highways?
1 Answers
There are many methods for speed detection on domestic roads, with the most commonly used being loop detection, radar speed measurement, and laser speed measurement. Since loop detection is highly accurate, it is one of the common speed measurement methods on many roads in China. However, loop detection requires road excavation to pre-install loops, which involves massive engineering and is not conducive to later maintenance, so this method is not widely adopted. Radar speed measurement utilizes the Doppler principle. The radar speed gun emits electromagnetic waves, which reflect off moving objects. The speed of the object is determined based on the frequency shift difference between the emitted and received waves. Since radar emits electromagnetic waves with a relatively wide beam area, radar speed guns can meet the requirements for multi-lane speed measurement in intelligent transportation. Laser speed guns are similar to radar speed measurement. They primarily measure speed by emitting laser beams and using the principle of distance measurement. However, because the laser beam area is very small, it requires precise aiming at a specific point on the vehicle, making it unsuitable for multi-lane speed measurement in intelligent transportation. Additionally, laser speed guns are relatively expensive, so radar speed guns are currently the primary method for speed measurement in China.
