What technology does radar speed detection rely on?

Radar speed detection relies on electromagnetic waves to measure the speed of moving vehicles. This technology functions by emitting radio waves, which travel through the air at the speed of light. When these waves encounter a moving object, such as a car, they are reflected back to the radar unit. The system then calculates the speed of the vehicle based on the frequency shift of the reflected waves, known as the Doppler effect.

The use of electromagnetic waves is critical because they can travel long distances and penetrate various environmental conditions, making radar highly effective for speed detection in varying circumstances. This capacity allows law enforcement to monitor vehicle speeds from a considerable distance, ensuring safety on the roads. Other technologies listed, such as sound waves or optical sensors, do not function in the same manner or with the same range and effectiveness for speed detection purposes.