Travel Time Reliability Reference Manual/Example Data

Below are graphs and data for an 6-lane urban freeway (I-43/I-894 near Milwaukee) and 4-lane inter-regional (I-94 west of Eau Claire). All data comes from the NPMRDS data set in January 2012. 6-lane urban freeway (4.35 miles) Free flow travel time is based on the 70th percentile travel time Reliability Index Value TTI 1.01 BI 0.26 OPT 94.90 PTI 1.27 TTI80 1.02 MI 1.40 Travel Time in minutes Mean 4.58 Free Flow 4.55 95th % 5.76 80th % 4.65 97.5th % 6.47 4-lane interregional freeway (20.18 miles) Free flow travel time is based on speed limit of 65mph Reliability Index Value TTI 1.03 BI 0.06 OPT 98.40 PTI 1.09 TTI80 1.038 MI 1.150 Travel Time in minutes Mean 19.26 Free Flow 18.63 95th % 20.38 80th % 19.33 97.5th % 21.42 The 3-D graphs below show travel times by day and by hour for each corridor. Visually, one can see the better reliability of the inter-regional corridor over the urban. Blank areas represent points where real-time data did not exist along the entire corridor. Travel Times for 6-lane Urban Freeway in January 2012 1400px|Travel Times for 6-lane Urban Freeway in January Travel Times for 4-lane Inter-regional Freeway in January 2012 1400px|Travel Times for 4-lane Inter-regional Freeway in January Previous Page → NPMRDS and INRIX Data Comparison Travel Time Reliability Reference Manual