ABN173

ORD 98-810
refers to truck routes but it has a non-business exception:

Section 4. Under this ordinance a, commercial vehicle shall include any self-propelled
or towed vehicle wmch alone or in combination possessed dual rear wheels or more than two axles, except that is shall not include any vehicle with dual rear wheels or more than two axles that is used by an individual or group of individuals solely for private and non-business purposes, emergency vehicles, military vehicles, and vehicles owned, leased or operated by federal, state, county or city governments or any political subdivision thereof.

(Still looking more info would help)

Dale