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Posted this video before but it's important enough to have its' own thread.
The Brits have an expression for the most common form of multi-vehicle accident: "Sorry Mate, I didn't See You" or SMIDSY.
The Hurt Report detailed how left-turning cars that did not see an approaching motorcyclist account for more than half of multi-vehicle crashes involving motorcycles when other factors (alcohol, etc) are removed.
If you are impatient but want a technique to help reduce the likelihood of this happening to you, go to the 5:00 mark of the video.
I've been doing the same thing since 1985, when I lived in a small town [Marblehead] with a lot of side streets and commuted through Salem to Beverly - ditto.
Tried everything: different colored helmets and jackets, waving, flashing headlights - without much effect. Tried the weave, it worked, and been doing it since. The video explains why: it minimizes the physiological effect of "Looming."