California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 6 - Division of Labor Standards Enforcement
Subchapter 9 - Farm Labor Contractors
Article 3 - Duties of Contractors
Section 13666.1 - Identification Signage at Worksite

(a) A licensee shall erect a temporary sign at each worksite where workers are working which prominently and legibly identifies the licensee's name, license number in the top-half portion of the sign, and a name and working phone number for the licensee's field supervisor in the bottom-half portion of the sign.

(b) The sign required in subdivision (a) shall be placed initially within 30 feet and be clearly visible from the access road nearest the worksite and where workers enter the worksite for the workday and shall not be obstructed by vehicles, other signs, trees, or other objects. The sign shall be no smaller than four (4) feet by four (4) feet and have contrasting colors for the background and lettering for legibility. The sign may be either staked in the ground or be fixed on a fold-out frame (A-frame when folded out) but the bottom of the sign shall be at least 12 inches above the ground.