Web Content Display

Graphics:

I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2011.  Click on graphic to open congestion scan.

I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2011 (click for pdf version)

I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2009.  Click on graphic to open congestion scan; click again to improve graphic resolution.

/assets/0/24/52/658/1574/1588/0c5077d4-d366-4cbd-b662-99032a8f26ec.jpg

 I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2009  (click for pdf version)

I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2007.  Click on graphic to open congestion scan; click again to improve graphic resolution.

 /assets/0/24/52/658/1574/1588/3f7aff9d-1298-4d00-ba23-49977c827b9e.jpg

 I-294, Tri-State Tollway from I-55 to I-90 Congestion Scan - 2007  (click for pdf version)

Performance Data:

Non-holiday Tuesdays, Wednesdays, Thursdays:

South-bound I-294/Tri-State Tollway

Measure 2007     2008    2009 2010 2011
Free-Flow Travel Time
(Minutes)		    16.64 17.04   16.99 17.74 17.81
Average AM Peak-Period
Travel Time (Minutes)		 17.74 17.93   18.22 18.88 18.69
AM Travel Time Index 1.07 1.05     1.07 1.06 1.05
Average PM Peak-Period
Travel Time (Minutes)		 25.24 22.82   20.41 25.72 24.77
PM Travel Time Index

1.52

1.34

1.07

 1.45 1.39
AM Peak-Period
95th Percentile Travel Time
(Minutes)

18.48

18.58

19.98

 22.11 20.05

AM Peak-Period
Planning Time Index

1.11

1.09

1.18

 1.25 1.13
PM Peak-Period
95th Percentile Travel Time
(Minutes)

38.34

35.83

29.04

 34.91 32.37
PM Peak-Period
Planning Time Index

2.30

2.10

1.71

 1.97 1.82
Congested Hours

3.22

2.13

2.75

 4.10 4.54

 

North-bound I-294/Tri-State Tollway

Measure

2007

  2008

   2009

 2010 2011
Free-Flow Travel Time
(Minutes)

    16.64

  16.59 

16.63

 17.31 17.88
Average AM Peak-Period
Travel Time (Minutes)

29.05

22.73

  19.00

 24.37 24.05
AM Travel Time Index

1.77

1.37

    1.14

 1.41 1.35
Average PM Peak-Period
Travel Time (Minutes)

18.27

18.12

  17.48

 18.24 19.02
PM Travel Time Index

1.11

1.09

    1.05

 1.05 1.06
AM Peak-Period
95th Percentile Travel Time
(Minutes)

44.42

37.45

  24.79

 39.45 36.01

AM Peak-Period
Planning Time Index

2.71

2.26

    1.49

 2.28 2.01
PM Peak-Period
95th Percentile Travel Time
(Minutes)

25.29

20.70

  19.33

 19.15 21.08
PM Peak-Period
Planning Time Index

1.54

1.25

    1.16

 1.11 1.18
Congested Hours

3.90

      1.88

    1.34

 2.69 4.61

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.