Section 554.507  Overlength

a)         Permits are required for empty vehicles that exceed legal dimensions, for objects that exceed 80 feet long, and for loads on a single vehicle or on the first vehicle of a combination that protrude 3 feet beyond the front bumper.  Protruding sections of a single vehicle (such as the boom of a mobile crane) may extend more than 3 feet beyond the front bumper.

b)         The practical maximum length for permit movements is 145 feet.  Permits may be issued for greater lengths on the basis of an individual movement analysis.