RideLondon: 'Biggest ever' cycle event held in London 2 August 2013 Last updated at 09:29 More than 70,000 cyclists are preparing to take part in the "biggest road cycling event ever in the UK" - to be held in London this weekend. The highlight of the RideLondon festival is a 100-mile race from London through Surrey, which will take place on Sunday. People in the city have been warned about disruption on the roads. Transport for London said residents should not "get caught out" and should plan their travel in advance. The area affected by the RideLondon-Surrey100 runs from the Queen Elizabeth Olympic Park through east, central and south-west London on to Surrey and finishing on The Mall in central London. London's Transport Commissioner, Sir Peter Hendy, said: "This is the largest event London's streets will have seen since the Olympics. During the London 2012 Games, Londoners and businesses took sensible steps to plan ahead and adapt their travel. I'm urging everyone to do that once again so that they don't get caught out and can continue to get around and enjoy the weekend. Mayor of London Boris Johnson will be one of about 20,000 cyclists taking on the 100-mile (160km) ride. He said he hoped to see "huge numbers of people doing the 100-mile cycling marathon." And he claimed: "It shows that London is in the lead in delivering cycling events."