The county zoning ordinance keeps oversized vehicles out of residential yards: trucks over three-quarter-ton class, motor homes, camp trailers, and boats are excluded from ordinary residential off-street parking, and stored recreation vehicles must fit trailer size caps and rear-yard placement.
St. Clair County residential district use lists (Sec. 40-4) allow off-street parking but exclude 'commercial vehicles or trucks of more than three-quarter (3/4) ton class, camp trailers, motor home and other recreation vehicles or boats,' unless spaces are specifically provided in the rear yard in addition to required dwelling parking. For recreation storage, Sec. 40-5-2 caps a stored camp or utility trailer at ten feet wide and thirty-eight feet long and requires rear-yard or enclosed-garage placement meeting accessory-building setbacks. There is no separate on-street length/weight limit in the County Code for unincorporated roads; oversized vehicle movement on highways is regulated by the Illinois Vehicle Code. Cities set their own oversized-vehicle limits.
Storing an excluded oversized vehicle in a residential district contrary to Sec. 40-4/40-5-2 is a zoning violation subject to a removal notice.
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