# Title 37 — Department of Transportation

## Article 37-06 — Multiple Vehicle Combinations

## Chapter 37-06-03 — Combinations of Two, Three, or Four Vehicles - Seventy-Five Feet or Less

### § 37-06-03-01. Authorized combinations of vehicles - Routes of operation.

The following combinations of vehicles may be operated on all North Dakota highways provided the
overall length does not exceed seventy-five feet [22.86 meters]:
1. Any combination of two units.
2. A truck-tractor and semitrailer may draw a trailer or semitrailer converted to a trailer by use of
a converter dolly and fifth wheel. This combination of vehicles is commonly referred to as an
A-train or a double bottom.
3. A truck-tractor and semitrailer may draw a semitrailer. This combination of vehicles is
commonly referred to as a B-train.
4. A combination of four units consisting of a truck-tractor, semitrailer, and two trailers. A
semitrailer used with a converter dolly is considered to be a trailer. This combination of
vehicles is commonly referred to as triple trailers or a triple bottom.
5. A motor vehicle drawing three motor vehicles attached to the towing motor vehicle by a triple
saddle mount. In such a mount, the front wheels of the towed motor vehicle are mounted upon
the bed of the towing vehicle, with any other towed motor vehicle being mounted in a like
manner on the preceding motor vehicle.
History: Effective October 1, 1983; amended effective November 1, 1987; March 1, 1999.
General Authority: NDCC 39-12-04
Law Implemented: NDCC 39-12-04
### § 37-06-03-02. Limited combinations of vehicles.

A motor vehicle may draw two trailers or two vehicles subject to the following conditions:
1. The towed vehicles, in addition to brakelights, stoplights, and turn signals, shall be equipped
with front and rear clearance lights, and side marker lights, and reflectors as prescribed by
North Dakota Century Code chapter 39-12.
2. All hitches must be of a load-bearing capacity capable of bearing the weight of the towed
vehicles.
a. The towing vehicle must have a hitch commonly described as a fifth wheel or gooseneck
design, or one that is attached to the frame.
b. The hitch on the rear of the vehicle connected to the towing vehicle must be attached to
the frame of the towed vehicle.
c. All hitches, other than a fifth wheel or gooseneck, must be of a ball and socket type with
a locking device or a pintle hook.
3. The drawn vehicles shall be equipped with brakes and safety chains adequate to control
themovement of, and to stop and hold, such vehicles. When the drawn vehicle is of a fifth
wheel or gooseneck design, safety chains are not required. If the gross weight of the second

drawn vehicle is three thousand pounds [1360.78 kilograms] or less, brakes are not required
on the second vehicle. When brakes are required, the brakes shall be so designed as to be
applied by the driver of the truck or motor vehicle from the cab. The brakes shall be so
designed and connected so that in case of an accidental breakaway the brakes shall be
automatically applied on the drawn vehicle that breaks loose.
History: Effective October 1, 1983; amended effective November 1, 1987.
General Authority: NDCC 39-12-04
Law Implemented: NDCC 39-12-04
