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Also, it's not just the size of the vehicle that needs to be taken into account, but the separation between them.
The real solution to such congestion problems is to simply let them become self-limiting, so that people either move elsewhere, time-shift* their travel, or telecommute.
*For instance, when I go to visit friends and have to pass through the urban area that lies between, the freeway is invariably congested - often bumper to bumper - southbound in the morning while I'm going northbound at full speed, and vice versa when I return in the evening.
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