Code of Alabama
Article 2 - Size and Weight.
Section 32-9-21 - Maximum Permissible Length and Width of Motor Bus.

(a) The term motor bus, wherever used in this section, means any motor-propelled vehicle used on the highways of this state for the transportation of passengers for hire.
(b) Except as provided in subsection (d), it shall be lawful to drive or operate upon any highway in this state any motor bus which does not exceed 45 feet in length, and eight and one-half feet in width, exclusive of detachable wind deflection devices which have been approved by the State Department of Transportation and safety equipment.
(c) The term articulated motor bus, wherever used in this section, means any motor bus, divided into joined sections, that actuates in a manner ensuring a turning radius which is less than a motor bus of the same length without such joined actuation.
(d) It shall be lawful to drive or operate on any highway in this state an articulated motor bus which does not exceed 60 feet in length, and eight and one-half feet in width, exclusive of detachable wind deflection devices which have been approved by the State Department of Transportation and safety equipment.
(e) Nothing contained in this section shall be construed to change in any way any law affecting the regulation of any motor bus except with respect to the maximum permissible length and width thereof.