More councils across the UK are introducing 20mph speed limits on residential streets, with proponents arguing they save lives and enhance community safety. However, critics contend that these limits increase journey times and add costs for businesses.
Wales implemented a default 20mph limit on most restricted roads in September 2023, and Edinburgh established Scotland's first city-wide 20mph network. Across England, 20mph limits have become more common, with over 30% of urban roads in Great Britain now subject to the restriction.
Birmingham has plans to introduce 20mph limits on all non-A roads, while Coventry City Council and Leicestershire County Council are considering similar approaches. Supporters, including the charity 20's Plenty For Us, suggest lower speeds can reduce the likelihood and severity of collisions, decrease traffic noise, and improve air quality.
Professor Panos Georgakis, an expert at the University of Wolverhampton, highlighted that a vehicle at 30mph has over twice the kinetic energy of one at 20mph, meaning injuries from accidents at higher speeds are likely to be more serious. However, some drivers and businesses argue that slower limits lengthen journeys and can reduce productivity.
Department for Transport data from last year indicated that 76% of drivers exceeded the limit on monitored 20mph roads under free-flow conditions. Opponents suggest that lower limits should be specifically targeted at roads with clear safety risks rather than being applied broadly.