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City staff briefs planning commission on developer workshop and how traffic impact analyses are required
Summary
Interim City Engineer Mike Garman reviewed city rules for when developers must produce traffic impact analyses and how warrants for signals and school crossings are applied; Development Services staff reported on a Jan. 29 developer workshop attended by several development firms.
Interim City Engineer Mike Garman told the Planning and Zoning Commission on Feb. 12, 2025 that the city’s street regulations set the thresholds and level of detail required for a traffic impact analysis (TIA) and that the city uses the Institute of Transportation Engineers (ITE) trip generation manual and the Manual on Uniform Traffic Control Devices (MUTCD) to make those determinations. "What's required for a TIA is spelled out in our street regulations," Garman said, and he added, "if it's anything less than 200 peak hour trips, we don't require traffic impact analysis."
Garman outlined how trip-generation estimates from the ITE manual are used to calculate new peak-hour trip ends and gave examples: a 96-unit single-family subdivision produces roughly 75 AM peak-hour and 100 PM peak-hour new trip…
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