Hackney carriage which a taxi may operate and include regulating the taximeter (not compulsory until 1907), the maximum age of the taxi (not more than 15 years), advertisements and the turning circle of . As part of the Transported by Design programme of activities, in 15 October 2015, after two months of public voting, the black cab was elected by Londoners as their favourite transport design icon. In London, hackney-carriage drivers have to pass a test called The Knowledge to demonstrate that they have an intimate knowledge of the geography of London streets, important buildings, etc. Learning The Knowledge allows the driver
Hybrid taxi control and fuel economy standards of their taxi cabs. Senator Gillibran is planning to reintroduce the legislation in 2011. The first hybrid taxicab in London entered operations in 2004. It was a diesel-electric hybrid black cab. The hybrid taxicab was developed by engine designer Azure Dynamics and London Taxis International with support from the Energy Saving Trust and the Department for Transport. Calgary introduced its first hybrid taxis in 2006 and the city's had 50 hybrid taxicabs by August 2010 roll out by Checker Yellow Cabs, Associated Cabs, and Mayfair Taxi. Other cities where taxi service is available with hybrid