Figure 3: Monthly Variation in Weekday Congestion due to Seasonal Factors: Houston, Los Angeles, and Chicago
Thursday, September 6, 2012
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
| Houston | Los Angeles | Chicago | |
|---|---|---|---|
| Jan | –0.216294028 | –0.012096943 | –0.850994748 |
| Feb | –0.029454818 | 0.724020468 | –0.231930471 |
| Mar | 0.186789726 | 0.860687182 | 0.039622471 |
| Apr | 0.21790421 | –0.652242511 | –0.384798326 |
| May | –0.129583329 | –0.666660929 | 0.366345709 |
| Jun | –0.204731169 | –0.202854984 | 0.525618652 |
| Jul | –0.303147959 | 0.130652301 | 0.237330595 |
| Aug | 0.041288585 | –0.86127211 | 0.238419204 |
| Sep | 0.455383463 | 0.256234117 | 0.674736147 |
| Oct | 0.349822007 | 0.30091998 | 0.54646909 |
| Nov | 0.309430884 | 0.69264748 | –0.129485633 |
| Dec | –0.677407572 | –0.57003405 | –1.031332691 |
NOTE: Each bar represents the degree of departure from the underlying long-term trendline. For example, the December seasonal factor for Chicago of approximately -1 means that, in December in Chicago, the number of congested hours per weekday is approximately 1 hour less than the overall trend for the weekday congestion.
SOURCE: Calculated from data used in preparation of Federal Highway Administration, Urban Congestion Report, April 2004-April 2007.