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City engineer outlines traffic-impact thresholds as council weighs annexations and master plan timing

Nampa City Council · April 16, 2026
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

City staff reviewed traffic-impact study (TIS) thresholds, the review process and how impact fees and the upcoming transportation master plan will guide right-of-way purchases and mitigation; council discussed annexations, enclaves and timing for large developers.

The city engineer briefed the council on the purpose and thresholds of traffic-impact studies and how those studies are used to scope mitigation for new development.

"The triggers that require a traffic impact study are any development that creates more than 100 vehicle trips in a peak hour or more than 1,000 vehicle trips in a given day," the city engineer said, describing how the ITE trip-generation manuals and MUTCD warrants are…

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