County officials warn new developments can trigger costly turn lanes, state funding rules
Commissioners and staff said traffic studies determine whether developments must pay for turn lanes and road upgrades; examples cited costs of $250,000–$300,000 for required turn lanes and the risk of losing state road funding if standards aren't met.
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Speakers at the Saint Clair County work session repeatedly linked proposed subdivision rules to traffic thresholds that can trigger road improvements and developer obligations. Commissioners said a traffic study can require a turn lane or other geometric changes on a state highway, in some cases costing “$250,000 to $300,000” to construct, and that such costs are typically borne by developers.
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