As for as memorials go, these seem pretty straightforward and tame, but some people want them removed.
They haunt the sides of roads, those ghostly white bicycles locked in place where a rider once died. The people who put them there don’t want credit. It is as if the bikes arrived on their own to remind motorists the price paid when people forget to share the road. There are eight such bikes in the Capital Region and hundreds around the world, from Australia to Ukraine. As memorials, ghost bikes began in St., Louis, Mo., in 2003. (via A ghostly reminder of a bicyclist - Times Union)