Personally, I don't. I always think about it. I watch my back at every single crossing. Every one of them, zero exception. I slow down when it goes down hill.

Personally, I don't. I always think about it. I watch my back at every single crossing. Every one of them, zero exception. I slow down when it goes down hill. I slow down when cars are next to me. I don't care if some bikes pass me full speed like "hey look how fast i go". I don't go slow either, but I'm not "full speed". Bikes brake very poorly, specially road bikes. (Mountain bikes brake a lot better, btw. Much larger tire.) Also important, if there are cars parked in busy areas I go on the far left of the bike lane (there's no way you can anticipate being door'd). Saves me about twice a week. I go back on the far right whenever there's no cars parked. And when there's no bike lane and cars go by relatively fast, I just claim the lane (of course you need to go nearly as fast as cars for that, else you're going to piss off a lot of people and create traffic issues).