Auto is defined in the commercial auto and commercial general liability (CGL) policies as any land motor vehicle, trailer, or semitrailer designed for travel on public roads; or any other land vehicle subject to a compulsory or financial responsibility law or other motor vehicle insurance law where it is licensed or principally garaged.
The term "auto" does not include "mobile equipment." This definition is important in determining whether liability coverage is afforded under an auto liability policy or a CGL policy (in the case of mobile equipment).