Section 194.38 - Regulatory powers of department(1) It shall be the duty of the department:(b) To prescribe rules and regulations as to safety of operations and the hours of labor of drivers of motor vehicles operated under the authority of this chapter.(e) To act in accordance with 49 USC 14504 by making any finding, determination and otherwise doing any other thing necessary to proceed under that statute. Nothing in this paragraph shall permit the department to extend the length or weight of motor vehicles.(2) Nothing in this section shall permit the department to promulgate any rule under which the provisions of 49 CFR 390, 391, 392, 395, and 397 are applicable to, or enforceable with respect to, any farm truck or dual purpose farm truck combined with any semitrailer or farm trailer, or any vehicle combined with a horse trailer, if the vehicle combination's gross combination weight rating, registered weight, and actual gross weight do not exceed 26,000 pounds, the vehicle combination does not include a commercial motor vehicle described in s. 340.01 (8) (c) or (d), and the vehicle combination is operated solely in intrastate commerce.1971 c. 139; 1977 c. 29 s. 1654 (7) (a); 1981 c. 20, 42, 347; 1993 a. 16; 1999 a. 139; 2005 a. 65.