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The speed of a vehicle occluded by (hidden behind) another vehicle cannot be measured. This occlusion issue does not apply to fixed speed enforcement devices that can be mounted on poles or gantries up to 5-6 meters / 15 -20 ft high using radar as detection method. Fixed and handheld lidar systems reliable up to heights of roughly 2 meters / 7 ft.
Radar speed guns use a microwave signal that is directed at a vehicle; the Doppler effect is used to derive its speed. LIDAR speed guns utilize the time of flight of laser pulses to make a series of timestamped measurements of a vehicle's distance from the laser; the data is then used to calculate the vehicle's speed. [20]
A radar speed gun, also known as a radar gun, speed gun, or speed trap gun, is a device used to measure the speed of moving objects. It is commonly used by police to check the speed of moving vehicles while conducting traffic enforcement , and in professional sports to measure speeds such as those of baseball pitches , [ 1 ] tennis serves , and ...
I passed the speed limit by 10 mph, 50 in a 40 posting, as I rounded the corner and there sat an officer with a radar gun. I immediately pulled over; he was pleasant and professional.
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In March 2005 a BBC program Inside Out demonstrated how the LTI 20.20 LIDAR speed gun, of which 3,500 were in use in the UK, could create exaggerated reading. Errors came from two sources. 'Sweep errors' were as a result of the camera not measuring the distance to a fixed point on the vehicle but instead being 'swept' along the side of the vehicle.
The 2010 Cochrane Review of speed cameras for the prevention of road traffic injuries and deaths [1] reported that all 28 studies accepted by the authors found the effect of speed cameras to be a reduction in all crashes, injury crashes, and death or severe injury crashes. "Twenty eight studies measured the effect on crashes.
A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding .