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Transportation Performance Management

 

State Highway Reliability Report - Tennessee

In the line graphs below, FHWA has shifted the "Year" label in the x-axis back by one year, from Data Reporting Year to Data Collection Year. More information

The information displayed is provided by the State Department of Transportation (DOT) in their 2018 Baseline Performance Report, 2019 Highway Performance Monitoring System (HPMS) data submittal, and 2020 Mid Performance Period (MPP) Progress Report and has not been edited by FHWA. Any questions about individual State reports should be directed to the respective State DOT.

Please note: FHWA has posted data from State DOT reports to help bring context to their performance targets. This data may result in some discrepancies among published State DOT performance data due to data sources and reporting years used when establishing the performance targets.

Significant Progress Determination

Using data from the 2020 MPP Progress Report, FHWA has determined whether a State DOT has made significant progress toward achieving its individual targets for five National Highway Performance Program (NHPP) measures and one National Highway Freight Program (NHFP) measure, as described in 23 CFR 490.109.

Full Significant Progress Determination Table

  • Interstate Highway Reliable Person-Miles Traveled

    • Trend through 2021

      Desired trend: ↑

      Tennessee % of Interstate Highway Reliable Person-Miles Traveled


  • Interstate Highway Reliable Person-Miles Traveled 2017 2018 2019 2020 2021
    Condition/Performance 87.7 88.1 88.2 -- --
    Target -- -- 85.3 -- 83.0
  • Interstate Highway Reliable Person-Miles Traveled

    Using the Inrix tool and the NPMRDS data set to calculate the measure for 2014 – 2017, a trend line was developed which projected the 2019 value to 85.3% and the 4 year value to 83.0%. External factors were not used to modify the trend line for this period as data for this measure is not extensive and how projects impact it are not yet determinable.

    The statewide percent of person-miles traveled on Tennessee’s interstates that are reliable as of December 31, 2019 is 88.2%. TDOT’s Interstate Travel Time Reliability increased by 0.5% between January 1, 2018 and December 31, 2019. This outperforms the 2-Year target established in 2018 by 2.9% and suggests that TN will make significant progress towards achieving the 4-year target. Initial targets were set using limited data sets from the NPRMDS to calculate a trend line for the 2019 projected value. The lack of available data at the time caused TDOT to set conservative targets to mitigate potential variability in travel time reliability. This conservative target setting approach likely accounts for some of the difference between the actual and 2-year target values. Other factors that could contribute to the difference include fluctuations in raw data from INRIX including link changes and improved responses to nonrecurring congestion.

    N/A
    TDOT is expanding the Transportation Systems Management and Operations (TSMO) concept which will lead to better operations of our highways. The Traffic Operations Division is letting projects that specifically address reliability such as the I-24 Smart Corridor project. This project takes a comprehensive approach to managing the existing infrastructure and improving travel time reliability by integrating freeway and arterial roadway elements to provide drivers with accurate, real-time information to actively manage traffic. Additionally, the central software for the Traffic Management Centers is being updated which will lead to improved management activities. TDOT activities include evaluating expanding service patrols to the rural areas to help address incident management and decrease clearance time. The Traffic Operations Division is updating the TSMO Program Plan which will identify other potential projects to address reliability and performance measures in general. This plan update is focused on the major goals of the department to reduce congestion and improve reliability. Projects in this plan will not affect data during the current performance cycle.

  • Data Sources:
    Tennessee 2018, 2020 Biennial Performance Report
    Tennessee 2018, 2019, 2020 HPMS Data Submittal

  • Non-Interstate National Highway System (NHS) Reliable Person-Miles Traveled

    • Trend through 2021

      Desired trend: ↑

      Tennessee % of Non-Interstate NHS reliable Person-Miles Traveled


  • Non-Interstate NHS reliable Person-Miles Traveled 2017 2018 2019 2020 2021
    Condition/Performance -- -- 89.4 -- --
    Target -- -- -- -- 87.5

    Behind the data: For the first performance period only, baseline condition and 2-year targets are not required for the Non-Interstate NHS reliability measure.


  • Non-Interstate National Highway System (NHS) Reliable Person-Miles Traveled

    Using the Inrix tool and the NPMRDS data set to calculate the measure for 2014 – 2017, a trend line was developed which projected the 2021 value to be 87.75%. External factors were not used to modify the trend line for this period as data for this measure is not extensive and how projects impact it are not yet determinable. However, it appears the number was incorrectly cited as 87.5% when reported to and approved by TDOT's Oversight Committee. 87.5% was then communicated to TDOT's MPO partners and acknowledged as the target by the Tennessee Division of FHWA. Thus, 87.5% is the target despite the 87.75% projection.

    N/A
    N/A
    N/A
  • Data Sources:
    Tennessee 2018, 2020 Biennial Performance Report
    Tennessee 2020 HPMS Data Submittal


  • Interstate Highway Truck Travel Time Reliability (TTTR) Index

    • Trend through 2021

      Desired trend: ↓

       

      Tennessee Truck Travel Time Reliability Index


  • Truck Travel Time Reliability Index 2017 2018 2019 2020 2021
    Condition/Performance 1.35 1.37 1.35 -- --
    Target -- -- 1.35 -- 1.37
  • Interstate Highway Truck Travel Time Reliability

    Using the Inrix tool and the NPMRDS data set to calculate the measure for 2014 – 2018, a trend line was developed which projected the 2019 value to 1.35 and the 4 year value to 1.33. External factors were not used to modify the trend line for this period as data for this measure is not extensive and how projects impact it are not determinable yet.

    The statewide Truck Travel Time Reliability Index as of Calendar Year 2019 is 1.35. This is consistent with both the baseline and 2-Year target established in 2018.

    Initial 2 and 4-year targets were based on a trend line using the data available at the time. With 2 additional years of data to evaluate during the mid-performance cycle, it was noted that the fluctuation in the TTTR value is very slight. However, the System Performance Measures Working Group decided to adjust the 4 year target in order to ensure TDOT is able to make significant progress while setting an attainable target. This target is equal to the highest value for the last 3 years (2017-2019).

    TDOT’s 25-Year Long-Range Transportation Plan, is a policy plan that was adopted in 2016. The 25-Year Plan contains eight policy papers that cover a range of topics from demographics and employment changes and trends to travel trends and system performance. Each paper offers a set of policy recommendations influenced by peer state comparisons, TDOT’s strategic and operational goals, the Department’s Guiding Principles, and more than 20,000 community inputs gathered through public and stakeholder outreach. Important to this measure is policy paper Freight Logistics and Planning which supports the efficient movement of people and goods. TDOT is committed to provide a reliable transportation system to further this goal. As such, the adjusted target is consistent with the 25-Year Long-Range Transportation Plan and the Department’s use of current and readily available data.

    Several recently completed projects will improve reliability of freight operations. Those projects include widening of I-440 in Nashville and I-40 widening in Jackson. Additionally, there are approximately 15 railroad grant projects underway. The availability of rail freight reduces the need for trucking freight, which reduces capacity needs. Future projects include the I-24 Smart Corridor Project as well as the ITS expansion projects on I-40 near Nashville. These projects will help improve reliability for freight and other vehicles through TSMO solutions.

  • Data Sources:
    Tennessee 2018, 2020 Biennial Performance Report
    Tennessee 2018, 2019, 2020 HPMS Data Submittal


Significant Progress Determination

PLEASE NOTE: Each State’s performance target assessment is based on its own State-specific target methodology and program philosophy. Therefore, conclusions should not be drawn based only on the information in the 2020 Mid Performance Period Significant Progress Determination Results table. For example, the State may have set aggressive targets, and not met those targets, while another State may have set more easily attainable targets, and met those targets. FHWA understands that each State’s program is unique and therefore does not prescribe a methodology for States to set targets. States have the flexibility to use the methodology they deem most appropriate when setting their performance targets.

A State has met or made significant progress toward target achievement if “actual” condition/performance is equal to or better than the established two-year target or “actual” condition/performance is better than baseline performance 23 CFR 490.109 (e).

Tennessee 2020 Mid Performance Period Significant Progress Determination Results
Measure Area Measures Baseline Target Actual Better than Baseline? Achieved Target? Made Significant Progress? Consequences [23 CFR 490.109(f)]
The performance of the Interstate System Interstate Travel Time Reliability measure 87.7 85.3 88.2 Yes Yes Yes None
Freight movement on the Interstate System Freight Reliability measure 1.35 1.35 1.35 No Yes Yes None
Updated: 04/15/2021
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