An automobile dismantler’s tow vehicle used to tow a disabled vehicle may be equipped with flashing amber warning lamps.
A flashing amber warning lamp upon an automobile dismantler’s tow vehicle may be displayed to the rear when the automobile dismantler’s tow vehicle is towing a vehicle and moving at a speed slower than the normal flow of traffic.
Source:
Section 25253.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=25253.1..