Lorry drivers are being urged to look out for cyclists on London's roads in a new safety campaign.
Transport for London (TfL) wants to reduce the number of accidents involving bikes and lorries.
It said more than half of all cyclists killed on the city's roads involved collisions with heavy duty vehicles.
TfL has teamed up with car maker Ford, which is putting up warning signs to cyclists on the back of more than 2,000 of its trailers.
The signs read: "Cyclists - beware of passing this vehicle on the inside."
They aim to address the particular threat to cyclists who ride on the left side of lorries, where they are often out of view.
Posters featuring a cyclist near a lorry will be placed across London as part of the latest stage of TfL's Share the Road campaign.
The number of cyclists on London's main roads has risen by 72% since 2000, according to TfL.
It said of the 17 cyclists killed in the year to June 2006, nine were in collision with goods vehicles.
"The number of cyclists in London is increasing rapidly and we need them to feel safe," said London Assembly member Jenny Jones.
"Despite the overall fall in the number of cyclists injured, the number of cyclists killed by lorries continues to be way too high."