Graphics:

I-55 from I-294 to Veterans Parkway 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 I-294 to Veterans Parkway Congestion Scan - 2009  (click for pdf version)

I-55 from I-294 to Veterans Parkway 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 I-294 to Veterans Parkway 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)	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 Planning Time Index	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 Planning Time Index	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