"Traffic jams are minimized if a significant fraction of drivers break the rules by doing things like passing on the wrong side or changing lanes too close to an intersection. The insight comes from a cellular automata study published this month in the journal Physical Review E. In effect, people who disregard the rules help to break up the groups that form as rule-followers clump together. The risk of jamming is lower if all people obey the rules than if they all disobey them, according to the analysis, but jamming risk is lowest when about 40 percent of people drive like jerks."
I see this all the time. Cages drive with traffic, but bikes ride through traffic. I often pass through slow moving "clumps" of cages just to find the road in front of it completely clear. The only thing holding everyone up are a few twats at the front refusing to go over the speed limit by even 1kph.
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