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
Taxicab livery Almería), taxicabs are white with a red diagonal stripe going through the front doors; in Seville, they are white with a diagonal yellow stripe down the rear doors; in Bilbao, white with a horizontal red stripe on the front doors, etc. A notable exception is Barcelona, where taxicabs are fully black, except the doors and the boot lid, which are painted yellow. London taxis are traditionally black, with the term "black cab" meaning a licensed taxi with a meter. There is no actual livery requirement for London taxis although most are in fact painted black. Outside of London taxi licensing