The Interstate Highway system is governed by federal rules which allow 102" width. Get off the interstate and things can. As of a couple of years ago Kentucky, Maryland, Michigan (unimproved county roads only), New York (except qualifying or access highways and interstates), New Jersey and Oregon (some exceptions) had 8' maximum limits if you leave the interstate highway system. California limits many/most of their highways (again non Interstates) to no more than 40' length for motorhomes.
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