Lifted from another forum, with attribution.
Try the Weave
How many times have you approached an intersection with an oncoming car waiting to turn left, not really knowing if the driver sees you? I use a maneuver that I believe gets you noticed. I call it the weave.
As you approach the intersection, initiate a slight left-right movement with the bars, or by shifting your weight . Donít overdo itóall it takes is a slight lateral movement so your headlight visibly moves side to side.
Iíve been doing this maneuver for about two years now, and it seems to really get a driverís attention! Iíve had drivers start to pull in front of me, but as soon as I weave, they stop and look at me. Some look at me as if Iím nuts, but the important thing is they look.
I think two factors come into play here: A steady headlight gets lost in the background, and a side-to-side movement, like shaking your head, means no. I donít advocate flashing your high beam because some drivers perceive this as a ďgo aheadíí signal.
Iíve shared this maneuver with all my riding buddies, and they have given me positive feedback that it works. Of course, itís not 100 percent foolproof. Always assume the worst, cover your brake lever and be prepared to take evasive action.
Winter Garden, FL