VEH § 36605

The limitations as to width, as set forth in Chapter 2 (commencing with Section 35100) of Division 15, do not apply to any trailer or semitrailer, including lift carriers and tip-bed trailers, used exclusively for the transportation of implements of husbandry or tools used exclusively for the production or harvesting of agricultural products by farmers or implement dealers, except as follows:

(1) With respect to any trailer or semitrailer transporting a grain-harvesting combine, that vehicle shall not exceed a width of 144 inches.

(2) With respect to any other vehicle described in this section, that vehicle, or the load on that vehicle when that load consists of tools, shall not exceed a width of 120 inches.

(3) With respect to any trailer or semitrailer described in subdivision (c) of Section 36005, that vehicle, when towed upon a highway shall not exceed a width of 174 inches and shall be subject to subdivisions (b) and (c) of Section 36600.