The vast majority of licensed taxis in London are black, which is why they are universally known as "Black Cabs." This distinctive color became a standardized tradition in the early 20th century. In 1907, London authorities introduced a law requiring all taxis to be painted black to improve the appearance and professionalism of the city's transport. Beyond aesthetics, black was chosen because it was the cheapest paint color available at the time and was highly effective at hiding the soot and grime of a busy industrial city. Today, while the official name "Black Cab" persists, it is important to note that modern regulations allow taxis to be other colors; you will occasionally see them in silver, white, or even wrapped in full-body advertisements for movies, brands, or major events. However, for a vehicle to be a true "Hackney Carriage" (a cab that can be hailed on the street), it must meet strict Transport for London (TfL) specifications regarding its turning radius and accessibility. Despite the rise of colorful advertising wraps and new electric models like the LEVC TX, the classic black silhouette remains the enduring symbol of London's taxi fleet and a globally recognized icon of the city's heritage.