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 two performance measures.

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?

States must establish two- and four-year travel time reliability performance targets for both the Interstate system and the non-Interstate National Highway System (NHS) every four years. Once the state informs the MPO it has set its performance targets, MPOs have 180 days to either set their own quantifiable four-year targets for the metropolitan planning area or support the state’s established four-year targets.

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 four years to the MS Department of Transportation (MDOT), and evaluates its progress toward achieving established targets every five 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 a.m. – 10 a.m. Monday – Friday)
Midday (10 a.m. – 4 p.m. Monday – Friday)
Afternoon Peak (4 p.m. – 8 p.m. Monday – Friday)
Weekends (6 a.m. – 8 p.m.)

Baseline Performance
Performance Measure 2021 Mississippi Baseline 2021 Jackson MPO Baseline
% of reliable person-miles traveled on the interstate 99.6% 98.6%
% of reliable person-miles traveled on the non-interstate NHS 95% 90.7%
Travel Time Reliability Targets
Performance Measure 2022-2025 Targets
% of reliable person-miles traveled on the interstate >93%
% of reliable person-miles traveled on the non-interstate NHS >85%

Resolution to Support the 2022-2025 Travel Time Reliability Targets

Jackson MPO Travel Time Reliability Analysis

National Highway System (NHS)

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