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-88, Aurora Toll Plaza to I-355
Feb 3, 2014
I-88 (Aurora Toll Plaza to I-355) Congestion and Crash Scans
Congestion Scan
I-88, Ronald Reagan Memorial Tollway, from Aurora Toll Plaza to I-355 (south junction). 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 above)
Download high-resolution PDF (trucks only)
I-88, Reagan Memorial Tollway Mitchell Road to I-355 Congestion Scan, 2011. Showing average speed by milepost by time of day.
Crash Scan
I 88, Ronald Reagan Tollway, Mitchell Road to I-355 crash scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.
Performance Data
Non-holiday Tuesdays, Wednesdays, and Thursdays:
East-bound I-88/Reagan Memorial Tollway
Measure | 2010 | 2011 |
---|---|---|
Free-Flow Travel Time (Minutes) |
13.73 | 14.23 |
Average AM Peak-Period Travel Time (Minutes) |
14.86 | 16.93 |
AM Travel Time Index | 1.08 | 1.19 |
Average PM Peak-Period Travel Time (Minutes) |
14.36 | 14.89 |
PM Travel Time Index |
1.05 |
1.05 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
17.82 |
24.26 |
AM Peak-Period |
1.30 |
1.70 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
15.04 |
15.59 |
PM Peak-Period Planning Time Index |
1.10 |
1.10 |
Congested Hours |
0.51 |
1.65 |
West-bound I-88/Reagan Memorial Tollway
Measure |
2010 |
2011 |
---|---|---|
Free-Flow Travel Time (Minutes) |
13.80 |
13.89 |
Average AM Peak-Period Travel Time (Minutes) |
14.54 |
14.73 |
AM Travel Time Index |
1.05 |
1.06 |
Average PM Peak-Period Travel Time (Minutes) |
14.65 |
15.49 |
PM Travel Time Index |
1.06 |
1.12 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
15.60 |
15.76 |
AM Peak-Period |
1.13 |
1.13 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
16.76 |
19.10 |
PM Peak-Period Planning Time Index |
1.21 |
1.38 |
Congested Hours |
0.52 |
1.09 |
About the Data
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.
Feb 3, 2014
I-88 (Aurora Toll Plaza to I-355) 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.
Congestion Scan
I-88, Ronald Reagan Memorial Tollway, from Aurora Toll Plaza to I-355 (south junction). 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 above)
Download high-resolution PDF (trucks only)
I-88, Reagan Memorial Tollway Mitchell Road to I-355 Congestion Scan, 2011. Showing average speed by milepost by time of day.
Crash Scan
I 88, Ronald Reagan Tollway, Mitchell Road to I-355 crash scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.
Performance Data
Non-holiday Tuesdays, Wednesdays, and Thursdays:
East-bound I-88/Reagan Memorial Tollway
Measure | 2010 | 2011 |
---|---|---|
Free-Flow Travel Time (Minutes) |
13.73 | 14.23 |
Average AM Peak-Period Travel Time (Minutes) |
14.86 | 16.93 |
AM Travel Time Index | 1.08 | 1.19 |
Average PM Peak-Period Travel Time (Minutes) |
14.36 | 14.89 |
PM Travel Time Index |
1.05 |
1.05 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
17.82 |
24.26 |
AM Peak-Period |
1.30 |
1.70 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
15.04 |
15.59 |
PM Peak-Period Planning Time Index |
1.10 |
1.10 |
Congested Hours |
0.51 |
1.65 |
West-bound I-88/Reagan Memorial Tollway
Measure |
2010 |
2011 |
---|---|---|
Free-Flow Travel Time (Minutes) |
13.80 |
13.89 |
Average AM Peak-Period Travel Time (Minutes) |
14.54 |
14.73 |
AM Travel Time Index |
1.05 |
1.06 |
Average PM Peak-Period Travel Time (Minutes) |
14.65 |
15.49 |
PM Travel Time Index |
1.06 |
1.12 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
15.60 |
15.76 |
AM Peak-Period |
1.13 |
1.13 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
16.76 |
19.10 |
PM Peak-Period Planning Time Index |
1.21 |
1.38 |
Congested Hours |
0.52 |
1.09 |
About the Data
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.