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Committee adopts PM‑3 travel‑time reliability standard 1.55 for planning; members clarify meaning of reliability
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Summary
The Lubbock Transportation Policy Committee unanimously approved Resolution 2025‑09 adopting PM‑3 interstate and non‑interstate travel‑time reliability targets, including a 1.55 congestion/reliability index used statewide. Members questioned and clarified what ‘‘reliability' means in practice.
The Lubbock Transportation Policy Committee on April 15 unanimously approved Resolution 2025‑09 adopting performance measures for travel‑time reliability and congestion (PM‑3) for use in 2025, endorsing a 1.55 congestion/reliability index that TxDOT uses statewide.
Mr. Jones, the TxDOT presenter, told the committee the PM‑3 targets were readopted by the commission for 2025 and that the measures assess interstate movements, congestion mitigation and air‑quality improvements where applicable. He explained the 1.55 congestion index compares peak‑period travel time to free‑flow travel time: for example, a trip that normally takes 20 minutes would take about 30 minutes during heavy congestion under a 1.55 index (a roughly 50% longer travel time).
Committee members asked for clarification about the distinction between congestion and reliability. Jones said reliability refers to the consistency of travel times over repeated trips; a segment can be congested but still reliably congested if delays are consistent day‑to‑day, whereas unreliable segments display wide variation in travel time. Members discussed local versus statewide measures: Jones said the 1.55 index is a statewide standard that includes large urban interstates; local measures in Lubbock historically have been lower (he cited a past TTI estimate near 1.08 for the area).
After the presentation and questions about how construction and school traffic are treated in the analysis, Commissioner Dolby moved to approve Resolution 2025‑09 and Council Member Martinez Garcia seconded. The committee voted unanimously to adopt the PM‑3 measures; the transcript does not record individual roll‑call votes.
The adopted PM‑3 target will be used in MPO planning and project prioritization and will feed into TxDOT and FHWA performance reporting.
Votes at a glance: Resolution 2025‑09 — approved unanimously; motion by Commissioner Dolby, second by Council Member Martinez Garcia; individual votes not recorded in the transcript.
