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I-55 Stevenson Expressway (Lakeshore Drive to I-294)

Graphics

Graphics:

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2011, showing average speed by milepost by time of day. Click on graphic to open congestion scan.

 

 

 

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2011 (click for pdf version)

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2009, showing average speed by milepost by time of day. Click on graphic to open congestion scan; click again to improve graphic resolution.

I55Scan_2009

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2009 (click for pdf version)

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2007, showing average speed by milepost by time of day. Click on graphic to open congestion scan; click again to improve graphic resolution.

I-55, Stevenson Expressway from US 41/Lake Shore Drive to I-294 Congestion Scan - 2007 (click for pdf version)

Performance Data

Non-holiday Tuesdays, Wednesdays, and Thursdays:

South-bound I-55/Stevenson Expressway

Measure 2007 2008 2009 2010 2011
Free-Flow Travel Time
(Minutes)
15.94 15.98 16.20 16.24 16.30
Average AM Peak-Period
Travel Time (Minutes)
20.88 21.31 21.18 21.78 21.97
AM Travel Time Index 1.31 1.33 1.31 1.34 1.35
Average PM Peak-Period
Travel Time (Minutes)
34.02 37.91 35.44 33.67 35.00
PM Travel Time Index

2.13

2.37

2.19

2.07 2.15
AM Peak-Period
95th Percentile Travel Time
(Minutes)

28.20

30.68

29.79

33.34 31.43

AM Peak-Period
Planning Time Index

1.76

1.92

1.84

2.05 1.93
PM Peak-Period
95th Percentile Travel Time
(Minutes)

59.03

65.96

60.78

55.01 53.90
PM Peak-Period
Planning Time Index

3.72

4.13

3.75

3.39 3.31
Congested Hours

12.29

12.66

11.96

11.82 12.37

North-bound I-55/Stevenson Expressway

Measure

2007

2008

2009

2010 2011
Free-Flow Travel Time
(Minutes)

15.76

15.76

16.06

16.33 16.33
Average AM Peak-Period
Travel Time (Minutes)

36.15

33.04

31.10

30.87 30.67
AM Travel Time Index

2.29

2.10

1.94

1.89 1.88
Average PM Peak-Period
Travel Time (Minutes)

22.81

24.36

22.68

24.29 23.12
PM Travel Time Index

1.45

1.55

1.41

1.49 1.42
AM Peak-Period
95th Percentile Travel Time
(Minutes)

53.09

50.80

48.66

50.12 49.96

AM Peak-Period
Planning Time Index

3.37

3.22

3.03

3.07 3.06
PM Peak-Period
95th Percentile Travel Time
(Minutes)

34.02

39.43

33.59

35.20 34.22
PM Peak-Period
Planning Time Index

2.16

2.50

2.09

2.16 2.10
Congested Hours

12.35

12.41

11.33

11.97 12.27

 

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