My mindset? Use the mirror, expect the unexpected, and pedal defensively. And take the lane when needed. I bike what is safest for me, not necessarily what are the rules made for cars and not bikes. Filter to the front ( allowed by law here in MA) Texters in cars are a horrible menace to everyone and many people do it. Expect cars to run red lights, a common occurrence. Ipod zombies on the MUP, good luck with that. And I detest wheel suckers, get off my a$$. And pedal dirt when you can, commute by mt bike anyone? On singletrack.