I usually just move over as soon as I see a gap in traffic. Do it a lane at a time, signal all the way and do your best to make sure the drivers see you.

One thing you really need to look out for is when you are in a left turn lane. I have seen a stunt pulled many times by drivers that do not want to wait in line to make their left turn. They will stay in the through lane just to the right and scoot over as soon as there is a gap after the light turns green. Since you are usually slower than the driver in front, "you" become the gap. I was clipped in this situation about a year ago. The easiest way to tell if someone might be trying to do this is the distance they leave between them and the car in front.

Of course after dark there is a whole other set of problems...