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Jackson council pauses decision on traffic‑impact thresholds, asks staff for more examples and cost data
Summary
Councilors heard staff recommendations for clearer thresholds requiring simplified worksheets for 10–30 PM‑peak trips and a full traffic impact analysis for 31+ PM‑peak trips with 50% mitigation, but voted to continue the item for more examples, cost estimates and nexus study findings.
Jackson’s town council heard a detailed proposal on June 1 to standardize when developers must submit traffic impact analyses and travel‑demand management (TDM) plans, then voted to continue the item for more data and examples.
Charlotte Frey, the town’s transportation manager, told the council staff recommends exempting projects that generate fewer than 10 PM‑peak trips, requiring a short worksheet for projects generating between 10 and 30 PM‑peak trips, and requiring a full traffic impact analysis plus 50% mitigation for projects generating 31 or more PM‑peak trips. "That would require a full traffic impact analysis and 50% mitigation," Frey said, summarizing the staff recommendation.
Frey said the draft language draws on Institute of Transportation Engineers guidance and peer communities including Casper, Cheyenne, Aspen and Park City. She described the worksheet as a simple, roughly one‑hour submittal intended to capture basic mode‑share and site design measures; larger projects usually already commission full studies.
Councilors focused on several policy choices: how much planning‑director discretion to allow in the 10–30‑trip range; whether the town should emulate a lower threshold (some resort communities require mitigation for as few as two trips); and how to assess cumulative effects from incremental projects. Councilor Schechter said cumulative effects were a key concern and asked what tools the town has to evaluate multiple projects together. Frey said thresholds are a council policy choice and that lowering the numeric trigger would capture more small projects for review.
Several councilors asked staff for concrete examples and cost estimates so they could assess who would be affected by different thresholds. Council members and staff agreed it would be useful to review results from the town’s traffic‑impact nexus study at a joint meeting this summer before adopting formal changes.
Given those requests, the council unanimously voted to continue the item to the next related meeting so staff can provide more examples, cost information and refined language for the planning commission and future readings.
