Mont. Code Ann. § 61-9-416

(1) "Commercial tow truck" means a motor vehicle operating for compensation that is equipped with specialized equipment designed and intended for towing or the recovery of wrecked, disabled, or abandoned vehicles or other objects creating a hazard on the public roadways. If a tow truck owner or operator's business profits or benefits in any way from towing a vehicle, the tow truck must be considered a commercial tow truck for the purposes of Title 61, chapter 8, and this chapter.

(2) A commercial tow truck must be equipped with:

(a) not less than two red flares, two red lanterns, or two warning lights or reflectors. The reflectors must be of a type approved by the department.

(b) at least two highway warning signs as provided in 61-9-431.

(c) a dry chemical fire extinguisher of at least 5 pound capacity or an equivalent alternative type of fire extinguisher, approved by the department;

(d) a lamp emitting a flashing red or amber light meeting the requirements of 61-9-402(7), or both a red and amber light, mounted on top of the cab of the tow truck or on the top of the crane or hoist if the light can be seen from the front of the tow truck. The light from the lamp must be visible for a distance of 1,000 feet under normal atmospheric conditions and must be mounted so that it can be securely fastened with the lens of the lamp facing the rear of the tow truck upon which it is mounted. When standing at the location from which the disabled vehicle is to be towed, the operator of the tow truck may unfasten the red light and place it in a position considered advisable to warn approaching drivers. When the disabled vehicle is ready for towing, the red light must be turned to the rear of the tow truck upon which it is mounted and securely locked in this position. Additional red or amber lights of an approved type may be displayed at either side or both sides of the tow truck during the period of preparation at the location from which the disabled vehicle is to be towed.

(e) one or more brooms, and the operator of the tow truck engaged to remove a disabled vehicle from the scene of an accident shall remove all glass and debris deposited upon the roadway by the disabled vehicle that is to be towed;

(f) a shovel, and whenever practical, the tow truck operator engaged to remove a disabled vehicle shall spread dirt upon that portion of the roadway where oil or grease has been deposited by the disabled vehicle; and

(g) a portable electrical extension cord or other device for use in displaying stop, turn, and taillamps on the rear of the disabled vehicle. The length of the extension cord may not be less than the length of the combined vehicles. When a disabled vehicle is towed, the tow truck operator shall provide for the rear light that is capable of displaying a stop signal, turn signal, and taillamps by means of the extension cord or other device referred to in this subsection. subsection (2)(g).

(3) The operator of a commercial tow truck used for the purpose of rendering assistance to other vehicles shall, when the rendering of assistance necessitates the obstruction of a portion of the roadway, place a highway warning sign as required in 61-9-431.

(4) The owner or operator of a commercial tow truck who complies with the requirements of 61-8-906 and 61-8-907 and this section may stop or park the tow truck upon a highway for the purpose of rendering assistance to a disabled vehicle, notwithstanding other provisions of this code.

(5) A commercial tow truck company that is in compliance with 61-9-431 and that is operating an emergency service vehicle and using signal equipment in rendering assistance at a highway crash scene or in response to any other hazard on the roadway that presents an immediate hazard or an emergency or life-threatening situation is not liable, except for willful misconduct, bad faith, or gross negligence, for injuries, costs, damages, expenses, or other liabilities resulting from a motorist operating a vehicle in violation of 61-9-402(5).

(6) A person convicted of violating this section is subject to the penalties provided in 61-9-517.

Commercial tow truck – definition -- – requirements