Speed limit enforcement
action taken by appropriately empowered authorities to check that road vehicles are complying with the speed limit in force on roads and highways
Speed limits are enforced on most public roadways by authorities, with the purpose to improve driver compliance with speed limits. Methods used include roadside speed traps set up and operated by the police and automated roadside "speed camera" systems, which may incorporate the use of an automatic number plate recognition system. Traditionally, police officers used stopwatches to measure the time taken for a vehicle to cover a known distance. More recently, radar guns and automated in-vehicle systems have come into use.
A worldwide review of studies found that speed cameras led to a reduction of "11% to 44% for fatal and serious injury crashes". 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. The British Medical Journal recently reported that speed cameras were effective at reducing accidents and injuries in their vicinity and recommended wider deployment. An LSE study in 2017 found that "adding another 1,000 cameras to British roads could save up to 190 lives annually, reduce up to 1,130 collisions and mitigate 330 serious injuries."
History
The use of speed limits pre-dates both motorized vehicles and enforcement of the laws. Facing the invention of the automobile, many nations enacted speed limit laws, and appropriate measures to enforce them. The Locomotive Acts in the UK set speed limits for vehicles, and later codified enforcement methods.
“Speed limit enforcement” enters the record as action taken by appropriately empowered authorities to check that road vehicles are complying with the speed limit in force on roads and highways. Crown Archives preserves that source wording while asking what Speed, limit and enforcement can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 5, 2026. The linked authority identifier is Q12585339. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2017.
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This entry incorporates text from “Speed limit enforcement” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.