I'm skeptical of that. I think on average drive time goes down. A few steady drivers drastically reduce stop and go driving, and can eliminate those weird traff

I'm skeptical of that. I think on average drive time goes down. A few steady drivers drastically reduce stop and go driving, and can eliminate those weird traffic aftershocks where everyone slows down for nothing, just because someone slowed down at that point an hour ago. [1] Furthermore, the total time might be less on a good day, with aggressive driving, but the more aggressive drivers there are, the higher the likelihood of an accident, which takes substantially longer than slow drivers. t1 = aggro drive time t2 = slow drive time t3 = accident drive time small cities, say less that 500k, it's probably not worth it, because p(accident) is pretty low, freeway backups relatively rare, say in the neighborhood of .1 bigger cities though, traffic gets messed up all the time. t2 wins. t2 < p(accident) * t3 + p(1-accident) * t1 http://www.npr.org/2013/11/29/247825768/phantom-traffic-jams-what-causes-mysterious-highway-backups http://www.npr.org/2013/11/29/247825768/phantom-traffic-jams...