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Carver County advances updated 'mumble‑strip' policy after noise tests and safety review
Summary
Carver County staff recommended replacing older continuous rumble strips with newer sinosoidal “mumble” strips and broader use (centerline, edgeline, shoulder, transverse) after pilot installs and decibel testing showed lower exterior noise; board staff plan outreach to townships before formal adoption this summer.
Traffic engineer Whitney Schroeder told the Carver County Board of Commissioners on April 7 that the county’s 2013 rumble‑strip policy is outdated and prevents staff from installing a low‑cost countermeasure the county’s safety plan recommends.
Schroeder said a newer sinosoidal design — referred to in the meeting as a “mumble” strip — preserves driver warning cues while reducing exterior noise. She described two pilot installations (County Roads 40 and 11) and said field decibel readings showed the new design measured roughly 10 dB lower at 100 feet compared with the older rectangular pattern, while…
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