Tow trucks must utilize their overhead emergency lights, required to be on all tow trucks licensed by this chapter, while standing on a roadway for the purpose of conducting a tow, and while actively engaged in the preparation for towing and transportation of a towed vehicle. These lights must be amber in color unless the truck is actively engaged in the recovery of a motor vehicle and is blocking one or more lanes of travel, at which time red lights are authorized. (1952 Code § 10-23-03.2)