I've been calling these monuments to dead bikers "ghost bikes" on my own time and I was of the (stupid) opinion that I invented the term until I googled it today:
ghostbike.org
ghostcycle.org
visualresistance.org
And. The very interesting Wikipedia Page:
"The first ghost bike memorial project was in St. Louis, Missouri, United States in October, 2003. After observing a motorist strike a bicyclist on Holly Hills Boulevard, Patrick Van Der Tuin placed a white-painted bicycle on the spot with a hand-painted sign "Cyclist Struck Here". Noticing the effect this had on motorists in the area, Patrick then enlisted the help of friends to place 15 more "ghost bikes" in prominent spots in the St. Louis area where cyclists had recently been hit by automobiles[2]."
