The advert, which was created by Russell Signs, highlights the environmental performance of its Fiat 500 TwinAir and the fact that owners do not need to pay the congestion charge.
Alongside the graphical elements, which spans four of the six sites available, the advert also incorporates three real Fiat 500 cars.
The showpiece site is supported by a campaign that encompasses other high-profile outdoor sites such as the Two Towers on the A4 and digital displays as well as other media including radio, TV, press and online.
Fiat's tiny 500 takes 50m ad space
Media agency Maxus has used four of Clear Channel's 96-sheet sites on London's Cromwell Road to create one of the UK's longest advertising faces for Fiat.
