GPS routing increases city throughput by shifting traffic jams onto residential streets

A trio of engineering researchers from UC Berkeley modeled the effect of heavy reliance on GPS routing on municipal road efficiencies and found that people who are GPS-routed are likely to move to surface streets and secondary highways when the main highways are congested; though this increases overall throughput in a city and reduces overall drive-time, it also creates heavy traffic on residential streets, effectively transferring traffic jams from highways to neighborhoods. (more")