ditto on the helmet, 26yrs ago my partner in a bike shop was riding four blocks from another job late at night when there was probably no traffic, I found him at the shop around midnight going into shock. Called the hospital and took him to the ER, the flew him out that night and he was in a coma for two and a half weeks. Cracked skull and a years worth of recovery. He made it back to the shop with his bike after whatever happened but we don't know, there were no witnesses and he didn't remember.