I have actually rear ended a car...... it was not at a stop sign, but rather someone who was so busy looking at me and at passing me that they failed to notice that a car was stopped parallel parking just up ahead. It was a rainy day so when they slammed on the brakes, even thought I put mine full on there was just no stopping in time. I tried to steer away and ended up putting my left hand through their right tail light... fortunately it was also cold, so I had on long finger gloves and that saved my a lot of cuts. I smashed a nail on one finger (it broke under the cuticle and eventually fell off....) but fingernails heal and tail lights don't...