Web Content Display
Graphics:
I-55 from US 41/Lake Shore Drive to I-294 Congestion Scan - 2009, showing average speed by milepost by time of day. Click on graphic to open congestion scan; click again to improve graphic resolution.
I-55 from US 41/Lake Shore Drive to I-294 Congestion Scan - 2009 (click for pdf version)
I-55 from US 41/Lake Shore Drive to I-294 Congestion Scan - 2007, showing average speed by milepost by time of day. Click on graphic to open congestion scan; click again to improve graphic resolution.
I-55 from US 41/Lake Shore Drive to I-294 Congestion Scan - 2007 (click for pdf version)
Performance Data:
Non-holiday Tuesdays, Wednesdays, and Thursdays:
South-bound I-55
| Measure | 2007 | 2008 | 2009 | 2010 | 2011 |
| Free-Flow Travel Time (Minutes) | 15.94 | 15.98 | 16.20 | 16.24 | 16.30 |
| Average AM Peak-Period Travel Time (Minutes) | 20.88 | 21.31 | 21.18 | 21.78 | 21.97 |
| AM Travel Time Index | 1.31 | 1.33 | 1.31 | 1.34 | 1.35 |
| Average PM Peak-Period Travel Time (Minutes) | 34.02 | 37.91 | 35.44 | 33.67 | 35.00 |
| PM Travel Time Index | 2.13 | 2.37 | 2.19 | 2.07 | 2.15 |
| AM Peak-Period 95th Percentile Travel Time (Minutes) | 28.20 | 30.68 | 29.79 | 33.34 | 31.43 |
| AM Peak-Period | 1.76 | 1.92 | 1.84 | 2.05 | 1.93 |
| PM Peak-Period 95th Percentile Travel Time (Minutes) | 59.03 | 65.96 | 60.78 | 55.01 | 53.90 |
| PM Peak-Period Planning Time Index | 3.72 | 4.13 | 3.75 | 3.39 | 3.31 |
| Congested Hours | 12.29 | 12.66 | 11.96 | 11.82 | 12.37 |
North-bound I-55
| Measure | 2007 | 2008 | 2009 | 2010 | 2011 |
| Free-Flow Travel Time (Minutes) | 15.76 | 15.76 | 16.06 | 16.33 | 16.33 |
| Average AM Peak-Period Travel Time (Minutes) | 36.15 | 33.04 | 31.10 | 30.87 | 30.67 |
| AM Travel Time Index | 2.29 | 2.10 | 1.94 | 1.89 | 1.88 |
| Average PM Peak-Period Travel Time (Minutes) | 22.81 | 24.36 | 22.68 | 24.29 | 23.12 |
| PM Travel Time Index | 1.45 | 1.55 | 1.41 | 1.49 | 1.42 |
| AM Peak-Period 95th Percentile Travel Time (Minutes) | 53.09 | 50.80 | 48.66 | 50.12 | 49.96 |
| AM Peak-Period | 3.37 | 3.22 | 3.03 | 3.07 | 3.06 |
| PM Peak-Period 95th Percentile Travel Time (Minutes) | 34.02 | 39.43 | 33.59 | 35.20 | 34.22 |
| PM Peak-Period Planning Time Index | 2.16 | 2.50 | 2.09 | 2.16 | 2.10 |
| Congested Hours | 12.35 | 12.41 | 11.33 | 11.97 | 12.27 |
