Commissioners debate requiring independent traffic studies as development increases pressure on county roads

Commissioners used extended discussion time to highlight a recurring problem: new subdivisions inside city limits or near jurisdictional boundaries funnel construction and long-term traffic onto county roads that were built for far fewer homes.

Commissioner Murphy and others said developers typically pay for traffic and flood studies that favor their proposals. "There's nothing independent about that," one commissioner said, arguing the county needs its own expert studies so it can reliably assess impacts on school-bus routes, emergency access and the county road network.

Speakers proposed several remedies: require developers to pay for studies the county selects, add study or mitigation costs to application fees, and use planning conditions that require developers to pay for needed turning lanes, red lights or widening on county roads. Commissioners acknowledged legal risk — developers could sue if the county is perceived to impose conditions outside its authority — but argued the county needs enforceable, technical evidence when projects are contested before planning bodies.

Staff said county planners have begun coordinating with city planners and sometimes already require traffic-shed analyses that address county impacts. Commissioners asked staff to compile examples where the county has required or obtained such studies and to explore whether the county can specify the approving expert or fund an independent review as part of the application process.

No formal policy change was adopted at the meeting; commissioners tasked staff and planners with follow-up and examples to bring back to the board.