The New York City Street Memorial Project holds its annual memorial ride and walk this weekend to commemorate bicyclers who have died while riding.
The Street Memorial Project is the group behind those bicycles painted white and locked to street signs around the city known as "ghost bikes" that honor people who have died in accidents while riding bicycles.
Since June 2005, according to the group's website, 80 ghost bikes have been installed in New York City to commemorate 128 known deaths.
The sixth annual memorial ride and walk takes place Sunday. Riders will travel to locations where cyclists died since January 2010.