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Commission debates traffic-study triggers and DOT/DES roles for subdivisions
Summary
Members weighed whether county traffic-study triggers (currently tied to an 11-lot threshold) should be changed to better match DOT trip-count thresholds and to avoid discouraging county-road development. Staff and a public commenter explained how DOT encroachment permits and DES septic rules affect local review.
Commissioners discussed when a developer should be required to pay for a traffic impact study and who sets the trigger. One commissioner asked why the county would require traffic studies at 11 lots when DOT’s operational triggers appear to focus on much higher trip counts: “If DOT isn't really hitting a trigger below 400, then why are we requiring a traffic study at 11 if DOT doesn't care till it hits 400?” the commissioner said, summarizing workshop commentary about a roughly 400-trips-per-day threshold.
Staff and consultants explained that DOT’s review is triggered by encroachment permits and road classifications, while county rules (and a prior settlement referenced in the meeting) had set a 10/11-lot local threshold for requiring studies and certain development reviews. Staff noted that traffic studies do more than count trips — they identify required upgrades, intersection needs and who must pay for improvements — and recommended consulting DOT for specific thresholds that could be mirrored or referenced in county language.
