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Clark County staff present higher traffic-impact fees and explain methodology
Summary
Transportation planner Susan Poisner told the commission that updated calculations — driven by a consultant-run travel demand model, project-level cost updates and a 20-year capital plan — produced proposed TIF rates that are higher than simple inflation adjustments; staff pointed to appendix pages 42–44 for private-share allocations.
Susan Poisner, Clark County transportation planner, told commissioners the county’s traffic impact fee update was completed with Metro/RTC and consultants and that staff received the TIF update "literally yesterday." The presentation described four county TIF districts, explained that rates are expressed as cost per average daily trip (calculated under Title 40) and noted that project cost estimates were updated to 2026 dollars using local bid information and the construction-cost index.
Commissioners pressed staff on several points: why the proposed rates are higher than an inflation-adjusted baseline, how the private share for each project is calculated, and the role of project phasing and timing for corridor capacity. Susan Poisner and staff said consultants used the regional travel-demand model to project trips from 2025 to 2045, then allocated trips to projects in a multi-step methodology (noted on page 38 and with tables on pages 42–45). Staff highlighted that average private-share percentages vary by project and that the overall private share cited in the presentation is an average across many projects.
