"A group in New York City has been installing bikes painted white at the sites of accidents where cyclists were killed...

In 2005, a member of the collective witnessed the immediate aftermath of a crash, and thought the group had to do something. 'We all felt it was our responsibility,' Singer said.

The idea of setting up a ghost bike was taken from a project in St. Louis, Missouri. These projects have since spread to over 200 locations around the world, including Austria, New Zealand, Cyprus, and Singapore.

It was jarring and emotional. It was planned as a one-time thing. Then just a week after the first ghost bike was set up, another cyclist was killed on the road, Singer said—and then another."

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