Riders cycle past Buckingham Palace during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (AL CHAREST/QMI Agency)
Riders cycle past Buckingham Palace during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (AL CHAREST/QMI Agency)
Riders during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (AL CHAREST/QMI Agency)
Riders during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012.(MARK BLINCH/Reuters)
Riders crash during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (STEFANO RELLANDINI/Reuters)
Netherlands' Marianne Vos (front), Russia's Olga Zabelinskaya (centre) and Britain's Elizabeth Armitstead during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (STEFANO RELLANDINI/Reuters)
Riders during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (STEFANO RELLANDINI/Reuters)
Canada's Clara Hughes (right) leads the pack during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (STEFANO RELLANDINI/Reuters)
Riders during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (STEFANO RELLANDINI/Reuters)
Riders sprint toward the finish line during the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (CATHAL McNAUGHTON/Reuters)
Marianne Vos of the Netherlands reacts as she crosses the finish line to win the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (PAUL HANNA/Reuters)
Gold medallist Marianne Vos of the Netherlands (centre), silver medallist Elizabeth Armitstead of Britain (left) and bronze medallist Olga Zabelinskaya of Russia stand on the podium during the victory ceremony for the women's cycling road race at the London 2012 Olympic Games, July 29, 2012. (PAUL HANNA/Reuters)