ghost bike
n.— «The latest incident came on the same day local cyclists had put up what’s called a ghost bike near the spot where 38-year-old William Korol died on Saturday in a hit-and run crash on Stony Plain Road. The ghost bikes, which are painted stark white, are meant as memorials to those killed riding Edmonton’s streets and as reminders for cyclists and drivers to mind each other on the roads.» —“Teen was well loved” by Glenn Kauth Sun (Edmonton, Alberta, Canada) Sept. 19, 2007. (source: Double-Tongued Dictionary)