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Under U.S. federal law, the use of radar or laser speed detectors is illegal nationwide in all commercial vehicles over 10,000 pounds. This includes most 18-wheelers.
This low-cost detector has impressive range and all the requisite features, including GPS for low-speed false-alert muting, manual marking of up to 100 known radar locations, and speed-camera alerts.
Additionally, many motorways, called smart motorways, have now been equipped with the newest signs and signals for variable mandatory speed limits and lane control. The system replaced the Automatic Incident Detection (AID) system which was trialled in 1989 on an 83 kilometres (52 mi) section of the M1 motorway . [ 1 ]
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 .
A 2017 Freedom of Information request found that 52% of speed cameras in the UK were switched on. The report showed that four out of the 45 police forces in the UK had no working speed cameras and that West Yorkshire, South Yorkshire, Greater Manchester, Kent and Cheshire police forces had a quarter or less active cameras.
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.
A worldwide review of studies found that speed cameras led to a reduction of "11% to 44% for fatal and serious injury crashes". [1] The UK Department for Transport estimated that cameras had led to a 22% reduction in personal injury collisions and 42% fewer people being killed or seriously injured at camera sites.
ISA was born in France when Saad and Malaterre (1982) carried out their study of driver behaviour with an in-car speed limiter. Actually, they did not really test Intelligent Speed Adaptation, because the system did not automatically set the correct speed limit; instead drivers had to set the limiter themselves, and, rather like a cruise control, they could set it as they chose.