GO 20 was launched today in Islington, London's first 20mph borough.
Children heard from Paralympian Danny Crates on how great it is to be active, took part in a safe cycling demo with Islington Council, carried out speed checks on traffic with help from the Met and celebrated 20mph by displaying their own banners and placards.
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Tributes have been left in Caledonian Road in Islington where 15-year-old Alan Cartwright died after he was stabbed.
A boy has died after he and his friends were attacked while cycling in north London.
Three police officers have been praised for their actions in helping a four-year-old boy who had become stuck on a roof in Newham.