MPs will gather this week to discuss the potential implementation of 20mph speed limits.The cross-party Transport Select Committee on Wednesday will hear evidence from experts regarding the benefits of slashing 30mph limits by 10mph as part of Labour's broader Road Safety Strategy, which was announced in January.A five-strong panel will be present to field questions from MPs, including Transport for London's chief safety officer and the former chair of the Welsh Government's 20mph Task Force Group.The Government is due to publish new guidance for 'setting local speed limits', which could include a new blanket 20mph restriction replacing 30mph zones in built-up areas.Some 62 out of 153 local authorities in England have already reduced their 30mph limits. Wales has 20mph as its default in built-up areas, and the Scottish Government imposes 20mph limits on 'those roads where it is appropriate to do so'.As such, around a third of roads in Britain's towns and cities are already subject to 20mph limits. MPs will gather this week to continue discussions with experts regarding the benefits of 20mph speed limitsAmong those presenting evidence supporting the wider use of 20mph speed limits is Adrian Berendt, director of the '20's Plenty for Us' road safety campaign.Lilli Matson, chief safety, health and environment officer at TfL - who previously steered Wales' transition to standardised 20mph roads - will also address the benefits of lowering limits.Ministers have been tasked with dramatically improving road safety standards in Britain.This includes ambitious targets, including a 65 per cent reduction in people killed or seriously injured (KSI) and a 70 per cent reduction in child KSIs by 2035.Under current rules, local authorities and National Highways play the lead role in ensuring safe speed limits are set on England's roads.However, the strategy has proposed setting out specific rules to dictate the setting of local speed limits.This includes the implementation of Sweden's 'Safe System'.This dictates that a road and speed limit must match the human body's ability to survive a crash, taking into consideration the laws of physics and road design to mitigate human error that can result in deadly collisions. Around a third of roads in Britain's towns and cities are already subject to 20mph limits. But MPs are considering a blanket restriction in built-up areas as part of the Road Safety StrategyWednesday's evidence session will see witnesses 'discuss whether the strategy's commitments on speed are sufficient to support its casualty reduction targets,' the transport committee says.Members will explore evidence around 20mph limits, including learnings from Wales and London, and witnesses could be pressed on whether England should follow Wales and move towards 20mph as the national default speed limit on roads.And they will quiz experts about driver behaviour, public attitudes to speeding, and the role of education and technology in helping to cut crashes.'The session will also consider how speed policy should be managed across national and local government, including whether current arrangements give local authorities the right balance of responsibility, guidance and support,' the committee says.In a similar call for evidence last month, the independent Parliamentary Advisory Council for Transport Safety recommended a blanket 20mph limit - reduced from 30mph - in built up areas to help spare authorities the financial burden of erecting new signage and filing paperwork to impose a slower restriction on roads in their communities. The number of people killed or seriously injured on Britain's roads last year increased by 4% compared with 2024, provisional data from the DfT published in May suggestsWednesday's meeting comes just a week after an investigation by the RAC revealed some of the most shocking instances of extreme speeding in lower-speed zones in the last 12 months.It exposed that more than 30,000 motorists were clocked at 30mph or faster on 20mph roads in 2025, and more than 275,000 were recorded travelling at least 10mph over 30mph limits last year.One motorist was snared travelling at 89mph on a 20mph stretch of road on the B5129 in Deeside, North Wales.Another was caught travelling at 114mph in a 30mph zone close to a primary school in Aylestone, Leicestershire.The RAC said the 'chilling speeds' at which some people drive show they 'remain oblivious to the incredibly severe risk'.Data gathered from 22 of England and Wales' 43 police forces in recent weeks also found that the wider introduction of 20mph zones has triggered a 500 per cent jump in motorists being caught by speed cameras.Just 21,125 drivers in the areas analysed were caught by roadside cameras exceeding 20mph limits in 2023, soaring to 127,915 cases last year as more authorities rolled out lower-speed zones.Official estimates published in May suggest the number of people tragically killed or seriously injured on Britain's roads last year increased by four per cent compared with 2024.However, in isolation, the number of deaths fell by three per cent.Provisional figures published by the DfT showed that 29,911 people were killed or seriously injured on our roads in 2025. 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