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 fleet each year (six vehicles), while smaller companies can replace up to two vehicles. The statewide Texas Green & Go Clean Taxi Partnership was built based on the San Antonio program’s success. As of July 2010, more than 100 of the city’s 843 taxis were hybrids. San Francisco became in 2005 one of the first cities to introduce hybrids for taxi service, with a fleet of 15 Ford Escape Hybrids, and by 2009 the original Escape Hybrids were retired after per vehicle. In 2007 the city approved the Clean Air Taxi Grant Program in order to encourage cab companies to