[cbloom]

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On major highways, sometimes the off-ramp is a lane separate from the highway, the exiters go off and cars coming in do so onto this lane, then the lane comes back in to the highway. Sometimes I use this lane as an opportunity to pass traffic or slow cars across all lanes.

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Oh, that reminds me of a super-advanced move. Sometimes you'll see a real short off-ramp, then it intersects a street with a light and leads straight into an onramp. If you're driving along on the freeway (right lane as usual) and you see the light turn green, you can hammer it, jump up the offramp and back down the onramp.

This isn't so much for efficiency as just for the fun of it.

BTW cops use this move from time to time to "disappear" when pacing.