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UK Speed Limits Explained and the Road Rules Catching Drivers Out

Many British motorists mistakenly believe speed cameras allow a 10 per cent buffer, yet the RAC warns that exceeding a posted limit by even 1mph is a criminal offence carrying a minimum £100 fine and three penalty points.
Thousands of drivers switching to light commercial vans receive unexpected penalties, as most vans are not car-derived and face lower speed limits than standard cars, including common models like Ford Transits and the smaller Transit Connect.
Driving at 70mph along a multi-lane road without a physical central reservation means committing a speeding offence, as the 60mph single carriageway limit still applies under British law despite the wide road layout.
Towing a trailer or caravan lowers the legal speed ceiling for ordinary passenger cars to 50mph on single carriageways and 60mph on dual carriageways, while Department rules stress posted limits are absolute maximums.
While the National Police Chiefs' Council recommends an enforcement threshold of 10 per cent plus 2mph to account for speedometer calibration, this does not constitute a legal right, as officers retain full discretion whether to issue fines.

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