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Residents object as board approves speed‑zone ordinance affecting Mooney Flat, Donner Pass and Cement Hill
Summary
After contested public comment from Mooney Flat residents, the Board adopted a speed‑zone ordinance that changes posted speeds on sections of Donner Pass, Mooney Flat and Cement Hill roads. Residents urged caution and better signage, and supervisors acknowledged limits on local enforcement and legal constraints tied to 80th‑percentile engineering rules.
The Nevada County Board of Supervisors voted May 14 to adopt a speed‑zone ordinance that updates posted speeds on three corridors after county traffic engineers presented multi‑day speed studies and collision reviews. The changes cover segments of Donner Pass Road, Mooney Flat Road and Cement Hill Road and implement speed limits set by the California Vehicle Code method (based on the 80th percentile of observed speeds, with limited statutory adjustments).
Engineers explained that, for Mooney Flat, measured speeds in some open stretches met the higher 80th‑percentile thresholds; one segment of Mooney Flat therefore was recommended to be posted at 50 mph (after permitted…
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