A shared road works better when being considerate matters more than arriving one place ahead.

The gains from driving aggressively are almost comically small. Cutting in, riding a bumper, refusing to let someone merge buys a place or two and perhaps forty seconds, at the cost of tightening the whole road behind you. Traffic behaves like a fluid, and every abrupt move sends a wave backward that somebody else absorbs. The person who leaves a gap is not being slow; they are keeping the system loose enough to move.

Leave a bigger following distance than feels necessary and let two people in on your way home. Notice how little the clock changes. The forty seconds were never the point.