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

4-lane interregional freeway (20.18 miles) Free flow travel time is based on speed limit of 65mph

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



Travel Times for 4-lane Inter-regional Freeway in January 2012



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Travel Time Reliability Reference Manual