CA Veh Code Section 36606

(a)

The limitations as to width, as set forth in Chapter 2 (commencing with Section 35100) of Division 15, do not apply to automatic bale wagons while operated as specified in Section 36102, except that such vehicles or the load thereon may not exceed 120 inches in width.

(b)

This section shall have no application to highways which are a part of the National System of Interstate and Defense Highways (as referred to in subdivision (a) of Section 108 of the Federal-Aid Highway Act of 1956).