UK - London - Aerial view of London congestion sign

Two pedestrians walk beneath a motorists' Congestion Zone sign on a London street. Seen from the top deck of a bus, we see from an aerial perspective the two men passing each other beneath the taller blue sign which line the capital's congestion zone, a traffic charging area ringing inner London, the boundary of the zone introduced in February 2007 to ease vehicle numbers and pollution and generate extra revenue for transport issues. The bright blue sign tells us that 2 miles down the road, the charge comes into effect from 7am to 6pm, weekdays. (Photo by In Pictures Ltd./Corbis via Getty Images)