I was slowly mashing my way up the mountain past a Sheriff's station when out of an alley, a Sheriff pulls out in his car and almost broadsides me! I saw a total of zero cyclists and zero pedestrians on that road so everyone just assumes no one is crazy enough to try to climb it. I was polite about it, though, and so was the Sheriff. I could see he was a bit embarrassed for almost hitting another person that he's supposed to protect and to serve.
Moral of the story - be careful about alleys. Even the cops can run you over.