The dangers posed by lorries to cyclists and pedestrians are to be highlighted in a road safety event.
Cyclists are being urged to take care near lorries
Two lorries will be parked in Trafalgar Square, central London, to allow other road users to see first hand how limited a lorry driver's vision is.
Metropolitan Police figures show that in 2006 nine cyclists were killed in London in accidents involving lorries.
The two-day event this week follows a campaign launched in March urging lorry drivers to look out for cyclists.
Ch Insp Mark Bird said: "Lots of people cycle in London and I'd encourage people to come along and see first hand just how easy the cause of these types of collisions can be and how easily avoidable they are.
"I have witnessed first hand the devastating affects that losing a loved one or family member can have, and we are determined to do all we can to reduce the risks to cyclists, and all road users."
In 2006 19 cyclists were killed in collisions - nine of which involved a goods vehicle.
The year before 21 cyclists were killed, nine involved lorries and in 2004 four of eight accidents in which cyclists were killed involved lorries.