I've had two identical, really annoying driving instances lately when merging onto the Glenn Highway. I was high up the ramp, sighted the target car I intended to merge behind, and as I entered the merge lane, I adjusted my speed to fall in line. Just as Skippy...as good a name as any...was in my left rear quarter, (s)he decided to slow down, as if doing me the favor of letting me into traffic. If I could have sent an e-mail at that very moment:
Dear Skippy,
You are more predictable when you maintain a constant speed. I can adjust my speed to yours and safely merge either ahead of, or in this case, behind you. When you slowed down in a position where you were least visible to me, you became unpredictable. I couldn't confidently gauge your speed or intent because you were only a tiny, distorted image in my towing mirror. I couldn't really know if you were being courteous, inattentive, or a nervous ninny...until you slowed down even more, further stacking traffic behind you during rush hour. Oh well, at least I got to romp the twin turbos as I ran out of merge lane.
P.S. Your driving is like turtles mating: it's very slow, it's very awkward, and nobody wants it happening right in front of them.