Projects stewarded by the U.S. Department of Transportation have shown that reducing traffic congestion has manifold benefits. The SURTRAC adaptive traffic control system implemented at some 20 Pittsburgh intersections has reduced travel time by 25 per cent and reduced GHG emissions by 21 per cent. Canada, which seeks to reduce its 2005 GHG levels by 20 per cent by 2020 – with vehicles accounting for 13 per cent of those levels – has nothing, or nearly nothing, like it. Advanced traffic signals can ease congestioned