Police have responded to the spate of cyclist deaths by posting hundreds of officers on London's busiest junctions. Six people were killed within two weeks of each other while riding in the capital this month.
Today, in a high-visibility operation, police are handing out penalty notices to drivers, and stern advice to cyclists who break the rules of the road. Piers Hopkirk reports.
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John, who began running for Age UK back in the 1980s when he was aged 53, has raised an incredible amount since then - more than £40,000.
It was Tom's second marathon in two weeks run in memory of his father, Martin Campbell.
Surrey Police are appealing for witnesses after the driver was seriously injured in the crash in the early hours of Saturday.