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More male perspective:
A wave comes across as too flirtatious, so unless that's the look you're after then I'd avoid it.
Thumb's up would be a universal way of saying you admire their car and you approve without getting followed to your destination.
However, if you're moving along and the other car's coming the opposite direction, you can give them the quick 4 finger wave without taking your hand off the wheel and they can see it and have time to react and reciprocate. It happens fast, and you don't have time to do much else.
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