Also, I think we (meaning state/federal government) could improve traffic flow greatly (but not cheaply) by making all exit ramps exit on both the left and the right. This would allow for fewer lane changes, which slow down traffic dramatically in high-volume situations. I don't envision putting offramps between lanes or anything like that, just because of the risk of running into the side of the offramp, but exits on both sides would help a lot, I think, especially on highways with two lanes in each direction.
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