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.

I-90/94, Dan Ryan Express Lanes, from 31st Street to I-90 Chicago Skyway. Congestion Scans, 2016.  Showing average speed by milepost by time of day.  

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.

Eastbound: 

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

Westbound:

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

Not: Trucks are not permitted on the I-90/94 express lanes, so no truck congestion scan was produced for this segment.

2007 performance measures are unavailable for this highway segment because of construction activity at the time. Performance measures will be produced for subsequent years when data is available.

Non-holiday Tuesdays, Wednesdays, and Thursdays:

East-bound I-90/94 Dan Ryan Express Lanes

West-bound I-90/94 Dan Ryan Express Lanes

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.