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-55 I-294 to Veterans Parkway
Jan 28, 2014
I-55 (I-294 to Veterans Parkway) Congestion and Crash Scans
Congestion Scans
I-55 from I-294 to Weber Road 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)
I-55 from I-294 to Veterans Parkway Congestion Scan, 2011. Showing average speed by milepost by time of day.
I-55 from I-294 to Veterans Parkway Congestion Scan, 2009. Showing average speed by milepost by time of day.
I-55 from I-294 to Veterans Parkway Congestion Scan, 2007. Showing average speed by milepost by time of day.
Crash Scan
I-55, Stevenson Expressway from I-294 to Veterans Pkwy. Crash Scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.
Performance Data
Non-holiday Tuesdays, Wednesdays, and Thursdays:
South-bound I-55
Measure | 2007 | 2008 | 2009 | 2010 | 2011 |
---|---|---|---|---|---|
Free-Flow Travel Time (Minutes) |
11.42 | 11.42 | 11.33 | 11.42 | 11.40 |
Average AM Peak-Period Travel Time (Minutes) |
15.02 | 14.70 | 14.13 | 14.36 | 14.60 |
AM Travel Time Index | 1.31 | 1.29 | 1.25 | 1.26 | 1.28 |
Average PM Peak-Period Travel Time (Minutes) |
22.92 | 20.58 | 18.77 | 18.07 | 19.04 |
PM Travel Time Index |
2.01 |
1.80 |
1.66 |
1.58 | 1.67 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
17.17 |
16.64 |
15.73 |
16.15 | 16.02 |
AM Peak-Period |
1.50 |
1.46 |
1.39 |
1.41 | 1.40 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
36.16 |
30.37 |
27.51 |
24.44 | 27.14 |
PM Peak-Period Planning Time Index |
3.17 |
2.66 |
2.43 |
2.14 | 2.38 |
Congested Hours |
12.28 |
11.80 |
10.58 |
10.94 | 11.24 |
North-bound I-55
Measure |
2007 |
2008 |
2009 |
2010 | 2011 |
---|---|---|---|---|---|
Free-Flow Travel Time (Minutes) |
11.40 |
11.44 |
11.44 |
11.52 | 11.44 |
Average AM Peak-Period Travel Time (Minutes) |
21.24 |
19.21 |
20.28 |
19.30 | 19.60 |
AM Travel Time Index |
1.86 |
1.68 |
1.77 |
1.68 | 1.67 |
Average PM Peak-Period Travel Time (Minutes) |
19.57 |
19.37 |
16.80 |
17.62 | 17.26 |
PM Travel Time Index |
1.72 |
1.69 |
1.47 |
1.53 | 1.51 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
35.86 |
32.87 |
35.24 |
31.78 | 30.57 |
AM Peak-Period |
3.15 |
2.87 |
3.08 |
2.76 | 2.67 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
38.41 |
38.82 |
30.25 |
31.01 | 28.68 |
PM Peak-Period Planning Time Index |
3.37 |
3.39 |
2.64 |
2.69 | 2.51 |
Congested Hours |
11.57 |
11.19 |
9.87 |
10.84 |
10.85 |
About the Data
Data provided by IDOT, Illinois Tollway, and HERE.
Jan 28, 2014
I-55 (I-294 to Veterans Parkway) 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 Scans
I-55 from I-294 to Weber Road 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)
I-55 from I-294 to Veterans Parkway Congestion Scan, 2011. Showing average speed by milepost by time of day.
I-55 from I-294 to Veterans Parkway Congestion Scan, 2009. Showing average speed by milepost by time of day.
I-55 from I-294 to Veterans Parkway Congestion Scan, 2007. Showing average speed by milepost by time of day.
Crash Scan
I-55, Stevenson Expressway from I-294 to Veterans Pkwy. Crash Scan, 2008-12. Showing number of crash rates per 100 million vehicle miles traveled.
Performance Data
Non-holiday Tuesdays, Wednesdays, and Thursdays:
South-bound I-55
Measure | 2007 | 2008 | 2009 | 2010 | 2011 |
---|---|---|---|---|---|
Free-Flow Travel Time (Minutes) |
11.42 | 11.42 | 11.33 | 11.42 | 11.40 |
Average AM Peak-Period Travel Time (Minutes) |
15.02 | 14.70 | 14.13 | 14.36 | 14.60 |
AM Travel Time Index | 1.31 | 1.29 | 1.25 | 1.26 | 1.28 |
Average PM Peak-Period Travel Time (Minutes) |
22.92 | 20.58 | 18.77 | 18.07 | 19.04 |
PM Travel Time Index |
2.01 |
1.80 |
1.66 |
1.58 | 1.67 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
17.17 |
16.64 |
15.73 |
16.15 | 16.02 |
AM Peak-Period |
1.50 |
1.46 |
1.39 |
1.41 | 1.40 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
36.16 |
30.37 |
27.51 |
24.44 | 27.14 |
PM Peak-Period Planning Time Index |
3.17 |
2.66 |
2.43 |
2.14 | 2.38 |
Congested Hours |
12.28 |
11.80 |
10.58 |
10.94 | 11.24 |
North-bound I-55
Measure |
2007 |
2008 |
2009 |
2010 | 2011 |
---|---|---|---|---|---|
Free-Flow Travel Time (Minutes) |
11.40 |
11.44 |
11.44 |
11.52 | 11.44 |
Average AM Peak-Period Travel Time (Minutes) |
21.24 |
19.21 |
20.28 |
19.30 | 19.60 |
AM Travel Time Index |
1.86 |
1.68 |
1.77 |
1.68 | 1.67 |
Average PM Peak-Period Travel Time (Minutes) |
19.57 |
19.37 |
16.80 |
17.62 | 17.26 |
PM Travel Time Index |
1.72 |
1.69 |
1.47 |
1.53 | 1.51 |
AM Peak-Period 95th Percentile Travel Time (Minutes) |
35.86 |
32.87 |
35.24 |
31.78 | 30.57 |
AM Peak-Period |
3.15 |
2.87 |
3.08 |
2.76 | 2.67 |
PM Peak-Period 95th Percentile Travel Time (Minutes) |
38.41 |
38.82 |
30.25 |
31.01 | 28.68 |
PM Peak-Period Planning Time Index |
3.37 |
3.39 |
2.64 |
2.69 | 2.51 |
Congested Hours |
11.57 |
11.19 |
9.87 |
10.84 |
10.85 |
About the Data
Data provided by IDOT, Illinois Tollway, and HERE.