LONDON'S TAXI TURNING CIRCLE REQUIREMENT: A full review of the pros, cons and future of the historic black cab feature
- Perry Richardson
- Aug 4
- 23 min read
London’s iconic black taxis are renowned for their manoeuvrability, notably their ability to “turn on a sixpence” in tight city streets. This stems from a unique turning circle requirement that mandates London hackney carriages be able to perform U-turns within a 25-foot (7.6 m) circle. The rule, in place for over a century, has become part of the capital’s taxi identity. However, it has also sparked ongoing debate over its practicality and impact. Supporters argue the tight turning circle enables efficient service on London’s narrow roads, while critics say it limits vehicle choice and drives up costs.
This in-depth report examines the history of the turning circle feature, how it works, and the pros and cons as viewed by key stakeholders including Transport for London (TfL), taxi manufacturers, drivers, and trade representatives. We also compare how other UK cities handle (or have scrapped) similar requirements. In the end, while the turning circle remains a cherished USP (unique selling point) of London’s taxis, we also look at whether the industry may need to one day adapt if manufacturers ever chose to stop building vehicles to meet the specification.
History of the Turning Circle Rule
The turning circle mandate dates back to the early 20th century. In 1906, a regulation was passed requiring the new motorised cabs to match the tight turning ability of horse-drawn hansom carriages. One popular anecdote links this requirement to the roundabout at Savoy Court by the Savoy Hotel – legend has it that cabs needed a 25-ft turning radius to navigate that driveway. Whatever its origins, the rule became enshrined in the Conditions of Fitness for London taxis. By law, a London taxi could have a turning circle no greater than about 25 feet (often quoted as 25ft diameter) – a standard that endures to this day. This capability has heavily influenced taxi design, giving rise to the distinctive high-arched front wheel wells and “sit up and beg” style of London cabs, all engineered for an exceptionally tight turning lock...
