The Olympic Village site for the 2012 Games should remain a car-free zone after the event, campaigners have said.
Athletes will live in the Olympic village during the Games
Carfree UK said it wants "the London Olympics to leave a lasting legacy of sustainability after the Games".
With the support of other green groups the proposal has been put to London's mayor and the Olympic Delivery Agency.
Friends of the Earth said car-free zones "are an important part of the solution to climate change and ... help improve local quality of life".
Tony Bosworth, of Friends of the Earth, said: "We strongly support car-free zones. We need more of these sort of developments in the future."
A spokesman for the Campaign to Protect Rural England (CPRE) said: "Car-free development has a key role to play in delivering sustainable urban communities.
"We welcome this important initiative to promote its benefits."