Web Content Display

Graphics:

I-290 Extension Congestion Scan - 2009.  Click on graphic to open congestion scan; click again to improve graphic resolution.

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 I-290 Extension Congestion Scan - 2009  (click for pdf version)

I-290 Extension Congestion Scan - 2007.  Click on graphic to open congestion scan; click again to improve graphic resolution.

/assets/0/24/52/658/1574/1576/a851cf67-c7ab-4380-b586-87cd8b9affea.jpg

 I-290 Extension Congestion Scan - 2007  (click for pdf version)

Performance Data:

Non-holiday Tuesdays, Wednesdays, and Thursdays:

East-bound I-290 Extension

Measure  2007      2008     2009
Free-Flow Travel Time
(Minutes)		    15.63 15.75    15.55
Average AM Peak-Period
Travel Time (Minutes)		 20.91 19.74    19.65
AM Travel Time Index 1.34 1.25      1.26
Average PM Peak-Period
Travel Time (Minutes		 28.64 27.58    26.56
PM Travel Time Index

1.83

1.75

     1.71
AM Peak-Period
95th Percentile Travel Time

29.50

24.90

   29.52

AM Peak-Perid
Planning Time Index

1.89

1.58

     1.90
PM Peak-Period
95th Percentile Travel Time

48.74

49.98

   47.31
PM Peak-Period
Planning Time Index

3.12

3.11

     3.04
Congested Hours

8.06

9.29

      5.72

 

 West-bound I-290 Extension

Measure

2007

  2008

 2009
Free-Flow Travel Time
(Minutes)

    15.57 

   15.68

 15.52
Average AM Peak-Period
Travel Time (Minutes)

20.42

19.29

18.47
AM Travel Time Index

   1.31

1.23

     1.19
Average PM Peak-Period
Travel Time (Minutes

21.31

22.96

   21.18
PM Travel Time Index

1.37

1.46

     1.36
AM Peak-Period
95th Percentile Travel Time

25.78

23.66

   23.41

AM Peak-Perid
Planning Time Index

1.66

1.51

     1.51
PM Peak-Period
95th Percentile Travel Time

31.01

37.83

   32.65
PM Peak-Period
Planning Time Index

1.99

2.41

     2.10
Congested Hours

9.98

9.74

     5.98

Web Content Display

Performance Measures

The travel time index is a measure of average congestion and indicates the average extra travel time required during peak period congestion. Travel time index is a ratio of the average peak-period travel time compared to the free-flow travel time. For example, a value of 1.20 means that average peak travel times are 20 percent longer than free-flow travel times.

The planning time index is a measure of reliability and is defined as the ratio of the total time needed to ensure a 95 percent on-time arrival to the free-flow travel time. For example, a value of 1.4 means that, to arrive on-time 95 percent of the time, a traveler should budget an additional eight minutes for a trip that takes 20 minutes during off-peak, free-flow conditions.

Congested hours are an indication of how many hours per day a facility is congested. Technically, "congested hours" are defined as the average number of hours in which at least 20 percent of the vehicle miles traveled (VMT) on the instrumented segment is congested. For this measure, congestion is defined to occur when link speeds are less than 50 mph.

Data provided by IDOT, Illinois Tollway, and Traffic.com.  CMAP's Todd Schmidt created the performance measures.