Thanks, Prophecy99 and Joggernot.
Actually, Prophecy99, I thought you were saying you knew a trucker-lingo-signal that meant that the trucker behind you should go ahead and pass you.
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And, back to the main subject, today I had some lady (I'm assuming, by the pink stickers and frame on the back of the minivan) honk three times blazing by passing on my left. She was gonna swing in immediately in front of me, except that I was letting in two cars merging onto the freeway, so it she changed her mind. lol.