I'm not sure how many of you are familiar with this. Strangers and now apparently friends and family members have been comemorating the deaths of cyclists on the road by attaching white painted bikes and a photo of the victim to the spot where the 'accident' occured. I saw one near Stoke Newington, North London this evening today
http://www.ghostbikes.org/london
http://www.ghostbikes.org/reactions