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<p>Rules 124-125 of The Highway Code set out the speed limits applicable on motorways
(including smart motorways), in accordance with the Road Traffic Regulation Act 1984.</p><p>Smart
motorways have variable mandatory speed limits to smooth traffic flow, and reduce
congestion, and have electronic signs to warn drivers of incidents ahead. This enables
less speeding, tailgating and fewer rapid changes of speed.</p><p>Enforcement by the
Police is one of a number of measures which are used to encourage compliance with
variable speed limits and ensure that schemes are working as intended.</p>
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