Knox County zoning caps recreational vehicles and trailers at 40 feet long and 10 feet wide (one per household), and limits commercial vehicles to one per household under 1.5 tons. Larger or additional oversized vehicles are not permitted in residential zones.
There is no separate oversized-vehicle ordinance; the limits come from the residential-zone parking sections. Section 3.52.03 permits one recreational vehicle or trailer per household not exceeding 40 feet in length or 10 feet in width, stored behind the front building line. Section 3.52.02 permits one commercial vehicle per household not exceeding 1.5 tons rated capacity. School buses are addressed separately (section 3.54), and inoperable buses count toward storage limits. Vehicles hauling hazardous materials are prohibited at residences. Municipalities set their own oversized-vehicle rules within city limits.
Storing a recreational vehicle over the 40x10 size limit, more than one per household, or an oversized commercial vehicle is a zoning violation enforced by Codes Administration; appeals go to the Board of Zoning Appeals.
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