Figure 1: Number of Congested Hours per Weekday: Monthly Average

Figure 1: Number of Congested Hours per Weekday: Monthly Average

Hours per day

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  Chicago
weekday congestion
Houston
weekday congestion
Los Angeles
weekday congestion
Apr-2004 12.93939 5.70075 7.297623
May-2004 13.604165 5.300922 7.658325
Jun-2004 13.951752 5.340904 7.200759
Jul-2004 14.061394 4.837309 8.099204
Aug-2004 13.100873 5.412273 7.178027
Sep-2004 14.328957 5.904757 8.738095
Oct-2004 13.293647 5.158723 9.119038
Nov-2004 13.133325 5.62083 9.470835
Dec-2004 11.97082 4.460309 8.869047
Jan-2005 13.67083 5.13333 9.016665
Feb-2005 12.561405 5.02082 10.045845
Mar-2005 12.807973 5.909426 10.163034
Apr-2005 13.25 6.230152 8.730161
May-2005 13.55 5.468252 8.908733
Jun-2005 13.54999 5.636363 9.431822
Jul-2005 13.234375 6.05 10.1125
Aug-2005 13.325754 5.855078 8.811591
Sep-2005 13.43334 5.753966 9.154757
Oct-2005 13.726195 6.107152 9.007933
Nov-2005 12.895835 5.687495 9.620835
Dec-2005 12.689827 4.833338 7.69048
Jan-2006 11.697373 5.066665 8.887495
Feb-2006 12.6375 5.325 9.262505
Mar-2006 13.076095 5.122995 10.108695
Apr-2006 12.212495 4.8875 8.395825
May-2006 13.3875 4.848486 7.871209
Jun-2006 13.454545 4.48864 9.25
Jul-2006 12.732457 4.30417 8.729165
Aug-2006 13.541668 4.97826 8.025369
Sep-2006 13.451752 5.849995 9.51667
Oct-2006 13.746209 5.946981 9.45075
Nov-2006 12.64583 5.80418 9.6875
Dec-2006 11.245605 4.879165 8.44999
Jan-2007 11.015866 5.37698 8.789685
Feb-2007 12.97916 5.812495 9.596489
Mar-2007 13.045459 5.79545 9.037877
Apr-2007 12.22778 5.801595 7.63889

NOTE: The number of congested hours per day are not directly comparable across different urban areas because data collection coverage on the freeway system in each urban area can vary dramatically. In this case, the data cover about 65 percent of all freeway lane-miles in Los Angeles, compared to about 22 percent in Chicago where data collection is focused on a smaller, more congested portion of the network. In addition, Chicago tends to have lower free-flow speeds on its monitored freeway network compared to Los Angeles.

SOURCE: Calculated from data used in preparation of Federal Highway Administration, Urban Congestion Report, April 2004-April 2007.