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Technical committee affirms support for TDOT's adjusted PM2/PM3 midpoint targets
Summary
The committee recommended the Executive Board back TDOT’s adjusted four‑year midpoint targets for PM2 (pavement/bridge reliability) and PM3 (travel time reliability and CMAQ emissions), following a staff briefing on the federally required target‑setting process.
The Knoxville Area TPO Technical Committee on March 11 recommended that the Executive Board endorse Tennessee Department of Transportation’s adjusted midpoint targets for PM2 and PM3, the federally required performance measures covering pavement/bridge reliability, travel‑time reliability and CMAQ emissions.
TPO staff explained the federal context: MAP‑21 and subsequent FHWA regulations require metropolitan planning organizations to track performance measures and either support state targets or set their own. TDOT elected to keep its four‑year pavement and bridge targets unchanged but adjusted PM3 reliability and emissions targets after reviewing 2024 trends.
Staff noted statewide trends that influenced TDOT’s changes: a decline in interstate travel‑time reliability (2021 baseline 92.1% down to 86.7% in 2024) and rising truck travel‑time delta values tied to freight volumes and major construction projects. TDOT’s updated reliability targets were lower in some categories and higher (less strict) for truck travel‑time delta; emissions targets for CMAQ were recalculated to reflect fewer recent CMAQ awards statewide.
TPO staff asked the technical committee to reaffirm support for the updated statewide targets and to transmit a resolution to the Executive Board. The committee moved, seconded and adopted the recommendation by voice vote; no roll‑call was recorded in the transcript.
