Ghost Bike

Ghost Bikes are small and somber memorials for bicyclists who are killed or hit on the street. A bicycle is painted all white and locked to a street sign near the crash site, accompanied by a small plaque. They serve as reminders of the tragedy that took place on an otherwise anonymous street corner, and as quiet statements in support of cyclists' right to safe travel.

http://ghostbikes.org/

This one is on Lauriston Road, Victoria Park, East London.