If you intend to stay in the city, renting a car in London might not be the best choice. The famous red double-decker buses and the underground tube, which connects most of the city, are two of the many public transportation options available in London. London's congested traffic, constrained roads, and congestion fees can also make driving there difficult. On the other hand, renting a car is a smart choice if you intend to travel outside of London.