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I-294 Tri-State Tollway (I-55 to I-94) Congestion and Crash Scans

The Chicago region traffic congestion scans were created by averaging five minute speed data obtained from freeway loop detectors, radar, and mobile technology data. The traffic scans display average speed on a freeway corridor as a function of time of day (the x-axis) and location (the y-axis) along a freeway corridor.

Crash scans show the rate of total highway crashes per 100 million vehicle-miles traveled (VMT) for 1/10 mile segments.  The purpose of these crash scans is to show highway planners and system managers how crashes are related to congestion.  Understanding where crashes are concentrated can help planners and engineers focus on improving those locations with the worst performance.  

Congestion Scans

I-294, Tri-State Tollway from I-94 to I-55 Congestion Scan, 2011.  Showing average speed by milepost by time of day.

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I-294, Tri-State Tollway from I-94 to I-55 Congestion Scan, 2009.  Showing average speed by milepost by time of day.

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Because of construction, 2007 graphics are unavailable for this highway segment.

Crash Scan

I-294 Tri-State Tollway, I-55 to I-94 Crash Scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.

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Performance Data

Note: Because of construction, 2007 data are unavailable for this highway segment.

Southeast-bound I-294/Tri-State Tollway

Measure

2008

2009

2010

2011
Free-Flow Travel Time
(Minutes)

23.20

23.46

22.95 23.53
Average AM Peak-Period
Travel Time (Minutes)

24.97

25.35

24.28 24.27
AM Travel Time Index

1.08

1.08

1.06 1.03
Average PM Peak-Period
Travel Time (Minutes)

26.63

25.55

24.12 24.41
PM Travel Time Index

1.15

1.09

1.05 1.04
AM Peak-Period
95th Percentile Travel Time
(Minutes)

27.39

27.84

25.40 25.03

AM Peak-Period
Planning Time Index

1.18

1.19

1.11 1.06
PM Peak-Period
95th Percentile Travel Time
(Minutes)

33.41

28.86

25.80 25.99
PM Peak-Period
Planning Time Index

1.44

1.23

1.12 1.10
Congested Hours

4.35

2.00

0.78 0.64

Northwest-bound I-294/Tri-State Tollway

Measure

2008

2009

2010 2011
Free-Flow Travel Time
(Minutes)

23.03

22.70

23.39 23.46
Average AM Peak-Period
Travel Time (Minutes)

24.79

25.34

26.60 26.48
AM Travel Time Index

1.08

1.12

1.14 1.13
Average PM Peak-Period
Travel Time (Minutes)

24.77

24.30

24.61 24.58
PM Travel Time Index

1.08

1.07

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

28.02

29.73

35.55 35.01

AM Peak-Period
Planning Time Index

1.22

1.31

1.52 1.49
PM Peak-Period
95th Percentile Travel Time
(Minutes)

26.90

26.58

26.07 26.26
PM Peak-Period
Planning Time Index

1.17

1.17

1.11 1.12
Congested Hours

3.04

2.32

2.09 2.03

 

About the Data

Data provided by IDOT, Illinois Tollway, and HERE. 

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