I know you should always be as cautious as you can be at all times, but I'm talking about who should do what. I'm speaking as both a biker as well as a driver.
when a commuter bikes on a sidewalk on the let side of the street, he crosses into the intersection, and there are cars wanting to make turns. Who has the right of way? What if the car is pulling out into the street? a car pulling from the street from the opposing direction (turning right)... a car pulling from the street going in the same direction (left turn).