Historical Perspective of Urban Traffic Congestion - Road Traffic Congestion - page 19

Fig. 3.4 Traffic congestion on a bridge approach, Tokyo, February 16, 1924. Source “ Wikimedia

Commons ” http://commons.wikimedia.org/wiki/File:Traf c_congestion.jpg

c congestion in and around the US and Canadian city centers increased in
the years following WWII.
A 1950 study of traf

Traf

c conditions in Chicago ' s central business district, for

example, reported that (on average) traf c delays across the Loop accounted for

time losses of 2 min per trip for auto drivers and 2- ½ min for bus transit riders.