Web Content Display

Questions or comments? Contact Tom Murtha.

Web Content Display

US 41 Lake Shore Drive (Monroe St to Marquette Drive) 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

US 41, Lake Shore Drive, from Monroe St to Marquette Dr.  Congestion Scan, 2016.  Showing average speed by milepost by time of day by direction of travel. 

Note: for best viewing, in Chrome, right-click on the graphic, then open in a new tab.  In other browsers, the image may be saved or downloaded as a PDF below.

Download high-resolution PDF (passenger vehicles only, as above).

Note: trucks are prohibited on Lake Shore Drive.

Note: 2016 Lake Shore Drive travel speeds were construction-impacted in the vicinity of I-55.

 

Crash Scan

US-41 Lake Shore Drive, Waldron Drive to 51st Street Crash Scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.

Download hi-res PDF

 

Performance Data

Non-holiday Tuesdays, Wednesdays, and Thursdays:

Note: Typical Lake Shore Drive speed limits are 40-45 mph; lower in certain locations

South-bound US 41/Lake Shore Drive

Measure 2007 2008 2009 2010 2011
Free-Flow Travel Time
(Minutes)
7.91 9.17 8.09 8.06 8.02
Average AM Peak-Period
Travel Time (Minutes)
8.22 9.54 8.59 9.64 8.70
AM Travel Time Index 1.04 1.04 1.06 1.07 1.08
Average PM Peak-Period
Travel Time (Minutes)
10.72 11.70 9.85 9.53 9.67
PM Travel Time Index

1.35

1.28

1.22

1.18 1.20
AM Peak-Period
95th Percentile Travel Time
(Minutes)

9.06

10.49

9.58

9.57 9.68

AM Peak-Period
Planning Time Index

1.15

1.14

1.18

1.19 1.21
PM Peak-Period
95th Percentile Travel Time
(Minutes)

13.75

15.37

12.39

11.22 11.84
PM Peak-Period
Planning Time Index

1.74

1.68

1.53

1.39 1.48
Congested Hours

3.76

3.66

12.09

13.66 10.18

North-bound US 41/Lake Shore Drive

Measure

2007

2008

2009

2010 2011
Free-Flow Travel Time
(Minutes)

7.79

9.03

7.95

7.95 8.02
Average AM Peak-Period
Travel Time (Minutes)

11.77

11.27

9.47

9.63 10.04
AM Travel Time Index

1.51

1.25

1.19

1.21 1.25
Average PM Peak-Period
Travel Time (Minutes)

8.67

9.91

9.59

10.56 10.09
PM Travel Time Index

1.11

1.10

1.21

1.33 1.26
AM Peak-Period
95th Percentile Travel Time
(Minutes)

23.87

18.32

14.32

13.25 14.19

AM Peak-Period
Planning Time Index

3.06

2.03

1.80

1.67 1.77
PM Peak-Period
95th Percentile Travel Time
(Minutes)

9.16

10.91

12.85

16.63 14.12
PM Peak-Period
Planning Time Index

1.18

1.21

1.62

2.09 1.76
Congested Hours

3.80

3.07

7.37

5.78 8.58

 

About the Data

2016 scans were prepared using the RITIS system, developed by the University of Maryland's CATT Lab.  Data comes from the National Performance Measure Research Dataset (NPMRDS), a HERE dataset made available to states and MPOs through the Freight Management and Operations Program of the Federal Highway Administration.  
 
Notice: 2016 congestion scans are based upon work supported by the Federal Highway Administration under contract number DTFH-13-C-00012. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not reflect the views of the Federal Highway Administration.
 

Loading more updates...