Preliminary MAP-21 Texas Transportation System Performance Results: National Highway System Performance


Pending adoption of final USDOT rules on national transportation performance management requirements, TxDOT leadership is taking steps to begin incorporating some aspects of those anticipated requirements in state transportation plans to better prepare the Texas transportation planning community for performance-based planning.

The information below presents the TxDOT/TEMPO-endorsed set of proposed national measures for use in Texas transportation planning efforts. The charts depict the FY 2014 performance results, together with short-term (FY 2018 – the end of the current Statewide Transportation Improvement Plan) and mid-term (FY 2025 – the end of the next Unified Transportation Program) performance targets at the statewide (and urban and rural, where appropriate) level for these measures. TxDOT and its partners will, of course, adapt this set of measures when the final federal rulemaking on national performance measures is available.

Summary Results

Goal: To work with the Metropolitan Planning Organizations (MPOs) to keep system delay and reliability within the targets set as proportion to population growth.

Definitions:

Hours of Delay: The time it takes to travel a given roadway minus how long it would take at the posted speed limit if there were no interference or congestion.

Reliability Index: The ratio of the 80th percentile travel time to the free-flow travel time.

The following charts show increases in congestion and less reliable conditions in all measures and on all road systems.

In general, congestion was significantly greater in FY 2014 than anticipated in the FY 2014 targets set last year.

The projected targets for FY 2018 and FY 2025 show a much more congested system in future years than in FY 2014.

  • For FY 2018, annual hours of delay is estimated to be between 14 and 35 percent higher depending on the measure, and, by FY2025, annual hours of delay is between 33 and 60 percent higher as compared with FY 2014 results depending on the measure.
  • The reliability measures all show conditions getting worse; however, the rate of change is not as high as with the delay-based measures. In FY 2018, the reliability indices grow between 0.01 and 0.08 and in FY 2025, the measures grew from 0.04 to 0.23 depending on the measure. This could be partially due to the assumption that as TxDOT had less capital funding to put into construction, more funding would be put into operations, which would improve the reliability of the road system.

Performance Measure: Annual Hours of Delay - National Highway System (NHS) (millions)

Performance Measure: Annual Hours of Delay - National Highway System (NHS) (millions)

Performance Measure: Annual Hours of Delay - Interstates (millions)

Performance Measure: Annual Hours of Delay - Interstates (millions)

Performance Measure: Annual Hours of Delay - Non-Interstate NHS (millions)

Performance Measure: Annual Hours of Delay - Non-Interstate NHS (millions)

Performance Measure: Reliability Index - NHS

Performance Measure: Reliability Index - NHS

Performance Measure: Reliability Index - Interstates

Performance Measure: Reliability Index - Interstates

Performance Measure: Reliability Index - Non-Interstate NHS

Performance Measure: Reliability Index - Non-Interstate NHS