Summary
Road safety campaigners are urging the UK government to introduce compulsory intervening speed limiters to stop repeat speeding offenders. The proposal follows data showing more than 270,000 drivers were caught exceeding 40mph in 30mph zones in 2025. Unlike current Intelligent Speed Assistance systems that mainly warn drivers, Intervening Intelligent Speed Assistance (IISA) technology could reduce throttle input and prevent vehicles from exceeding limits. Supporters argue the technology could help tackle dangerous driving and reduce casualties, while the government considers wider road safety measures.
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