I-55 from Veterans Parkway to I-80

May 27, 2015

I-55 (Veterans Parkway to I-80) Congestion and Crash Scans

The Chicago region traffic congestion scans we created by averaging five-minute speed data obtained from mobile technology data.  The traffic scans display average speed on a freeway corridor as a function of time of day (the x-axist) 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 Scan

I-55 from Weber Rd to I-80. 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 (all vehicles, as shown above)

Download high-resolution PDF (trucks only)

 

Crash Scan

I-55 Veterans Parkway to I-80 Crash Scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.

Download Hi-Res PDF

About the Data

Data provided by IDOT, Illinois Tollway, and HERE. 

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: This material is 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.
To Top