I imagine it could also make congestion more efficient. I believe a big factor to congestion is human behavior. We at least have good ideas about better ways to drive during congestion.. which humans rarely follow.
How would they "reduce or eliminate congestion"? Congestion is inherently caused by too many people trying to go to or through the same place at the same time. That's not possible without reducing the amount of people trying to travel during a given time period in a given place.
The research on that is pretty clear that it does alleviate congestion, the question is for how long. It can definitely take a while before that extra capacity is used up.
I think it could help solve congestion as a problem too.
Maybe cars could book their routes, and the road brokers will maximise for #cars/destination instead of allowing people to keep piling in even after the useful capacity is exceeded.
This would not reduce traffic, though. In fact it would increase traffic, because now cars are transiting between revenue trips instead of waiting at the curb.
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