The London 2012 fleet is bringing new carbon-cutting technology to the roads, from efficient diesel, hybrid and electric cars but can these technologies leave their own Olympic legacy.
Counter intuitively perhaps, the answer is no, as gripping TV means less people involved in higher energy activities.
The city faces regular gridlock but the challenge of accommodating the Olympics could trigger the innovation needed to keep the city moving full time.
In a visit to the Olympic Park on the eve of the London 2012 Opening Ceremony, UNEP Executive Director, Achim Steiner, gives the event the thumbs up for sustainability.
RTCC takes a look at some of the innovative ideas which have gone into making the 2012 Games arenas some of the most sustainable ever seen at an Olympic event.