Travel Time Reliability Performance Management

System Performance Management regulations require State Departments of Transportation (DOTs) and Metropolitan Planning Organizations (MPOs) to establish Travel Time Reliability targets for 2 performance measures.

NATIONAL GOAL PERFORMANCE AREA PERFORMANCE MEASURE
System Reliability Performance of the National Highway System (NHS)
  • % of person-miles travel on the Interstate System that are reliable
  • % of person-miles traveled on the non-Interstate National Highway System that are reliable
When do MPOs establish Travel Time Reliability targets?

When establishing Travel Time Reliability targets MPOs may support the state’s 4-year targets, or establish their own quantifiable target for the metropolitan planning area.  States must establish 2-and 4-year Travel Time Reliability targets for the Interstate and 4-year targets for the non-Interstate NHS system by May 20, 2018.  MPOs must establish Travel Time Reliability targets within 180 days of the State establishing and reporting its targets; no later than November 16, 2018 and every 4 years thereafter.

How are Travel Time Reliability targets reported?

States report their Travel Time Reliability targets to the Federal Highway Administration in their Performance Reports.  The Jackson MPO reports its targets every 4-years to the MS Department of Transportation (MDOT), and evaluates its progress toward achieving established targets every 5 years in the Metropolitan Transportation Plan.

How do you measure system performance?

Level of Travel Time Reliability (LOTTR) is defined as the ratio of the longer travel times (80th percentile) to a “normal” travel time (50th percentile), using data from the Federal Highway Administration’s National Performance Management Research Data set.  Data is collected in 15-minute segments during four time periods:

Morning Peak (6 – 10 a.m. Monday – Friday)
Midday (10 a. m. to 4 p.m. Monday – Friday)
Afternoon Peak (4 – 8 p.m. Monday – Friday)
Weekends (6 a.m. – to 8 p.m.)

The measures are the percent of person-miles traveled on the relevant portion of the NHS that are reliable (with 1.5 Travel Time Reliability being reliable and more than 1.5 being considered unreliable).

Baseline Data

System performance is currently under review and additional information will be provided in the future.

Travel Time Reliability Targets

System performance is currently under review and additional information will be provided in the future.

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