The ghost bike

A ghost bike, ghostcycle or WhiteCycle is a bicycle set up as a roadside memorial in a place where a cyclist has been killed or severely injured (usually by a motor vehicle).

Apart from being a memorial, it is usually intended as a reminder to passing motorists to share the road. Ghost bikes are usually junk bicycles painted white, sometimes with a placard attached, and locked to a suitable object close to the scene of the accident.