this is funny... I have often considered a similar campaign

just saw this campaign

YOU PARK LIKE AN ASSHOLE
http://youparklikeanasshole.com/

funny...
for years I have thought about similar campaigns
a simple one based off this
YOU DRIVE LIKE AN ASSHOLE

cyclists could have stickers on hand
then when a car passes them they could tag the car
sadly... some drivers would wear the stickers proudly
like fighter jets that mark each kill
while others would be embarrassed

SHAMING WORKS!

people should be ashamed at how they drive... people should be ashamed at how they drive around pedestrians and cyclists