Flowers offer in the cycle in the memory of a cycle rider Brian Dorling, is seen at Bow Road, East London, April 29, 2012. According to the report every year more than 17000 cyclists are killed or injured in Britain. Campaigners demand safer streets following the deaths of several riders on the streets. More than 5,000 cyclists on Saturday takes part in a rally aimed at persuading London's mayoral candidates to ensure roads are safer for those on bicycles.