BTS Technical Report: Seasonal Variation in Traffic Congestion: A Study of Three U.S. Cities

by Jeffery Memmott, Ph.D. and Peg Young, Ph.D.

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Most urban areas of the country face rising congestion levels as increasing volumes of vehicular traffic exceed the capacity of the transportation...

Figure 6: Monthly Variation in Los Angeles' a.m. and p.m. Congested Hours due to Seasonal Factors

Difference in congested hours per day from the trendline

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Figure 2: Monthly Average of Congested Hours per Weekday in Los Angeles

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

Figure 6: Monthly Variation in Los Angeles' a.m. and p.m. Congested Hours due to Seasonal Factors

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

Figure 8: Monthly Variation in Houston's a.m. and p.m. Congested Hours due to seasonal Factors

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

Figure 4: Monthly Variation in Chicago's a.m. and p.m. Congested Hours due to Seasonal Factors

Difference in congested hours per day from the trendline

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

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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...

Figure 3: Monthly Variation in Weekday Congestion due to Seasonal Factors: Houston, Los Angeles, and Chicago

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NOTE: Each bar represents the degree of departure from the underlying long-term trendline. For example, the December...

Figure 5: Monthly Variation in Chicago's Weekday and Weekend Congested Hours due to Seasonal Factors

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

Figure 3: Monthly Variation in Weekday Congestion due to Seasonal Factors: Houston, Los Angeles, and Chicago

Difference in congested hours per day from the trendline

Excel | CSV | Graphic Version