Oversized vehicles - anything with a GVWR of 14,001 lbs or more, plus commercial trailers and construction equipment - are banned from urban-residential public roads and limited to 12 hours per day elsewhere under SCC 11.05. RVs over the limit fall under the separate 72-hour RV rule (SCC 11.06).
Snohomish County treats 'oversized' vehicles through chapter 11.05 SCC. The threshold is a gross vehicle weight rating of 14,001 lbs or more where the principal use is transporting goods or use in construction, industry or farming - bulldozers, backhoes, tractors, and trucks fitted with cranes, compressors, welders or tanks are named. Such vehicles and commercial trailers are prohibited on public roads in urban-residential zones at any time and limited to 12 hours per 24-hour period in non-residential areas. Personal-use recreational travel trailers are excluded from 11.05 and are governed by the RV chapter (SCC 11.06).
A violation of chapter 11.05 SCC is a traffic infraction under chapter 46.63 RCW; no signage is required for enforcement.
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See how Snohomish County's oversized vehicle parking rules stack up against other locations.
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