Truck and trailer rules in Alberta: licence classes, trailer brakes, size limits and the safety fitness certificate

This page reports what the official source says. It is not legal advice: ask the office named here. All of the sources are regulations under the Traffic Safety Act, published by the Alberta King's Printer: the operator licensing regulation, the vehicle equipment regulation, the commercial vehicle dimension and weight regulation and the commercial vehicle certificate and insurance regulation. Federal background and the other places are on the parent page, trucks and trailers for tree work.

At a glance

Item	What the sources say
Class 5	A 2-axle single motor vehicle, or a 2-axle motor vehicle towing a trailer that has no air brakes
Class 3	A single motor vehicle with 3 or more axles, and that vehicle towing a trailer with no air brakes
Class 1	Any motor vehicle other than a motorcycle, or combination of vehicles; minimum age 18
Trailer brakes	Brakes adequate to control the trailer; automatic application for at least 15 minutes if it breaks away; listed exceptions
Width, height	2.6 metres wide; 4.15 metres high, including any load
Length	12.5 metres overall for a truck; 12.5 metres for a full trailer; 16.2 metres for a semi-trailer
Carrier certificate	Safety fitness certificate for a goods vehicle registered for a gross weight of 11,794 kilograms or more
Overdimension permit fee	CA$18.75 single trip; CA$75 multi-trip
Safety chain	Not published in the vehicle equipment regulation text read

Licence classes

The operator licensing regulation builds its classes on axles and on whether a trailer has air brakes, not on a weight line. The holder of a Class 5 licence may drive a 2-axle single motor vehicle, and a 2-axle motor vehicle towing a trailer with one or more axles if the trailer is not equipped with air brakes. The holder of a Class 3 licence may drive what a Class 5 holder may drive, plus a single motor vehicle with 3 or more axles, and such a vehicle towing a trailer with one or more axles if the trailer is not equipped with air brakes. The regulation also lets a Class 3 holder drive a mobile crane with a boom dolly when the operator is an apprentice or holds a trade certificate as a mobile crane operator. The holder of a Class 1 licence may drive a motor vehicle or a combination of vehicles; a motorcycle is not included. The Registrar may not issue Class 1, 2, 3 or 4 licences to a person under 18, and Class 5 to a person under 16. A first-time applicant for a Class 1 licence must complete mandatory training under section 15.1. The Class 2 and Class 4 licences cover buses, taxis and ambulances. See the Operator Licensing and Vehicle Control Regulation, AR 320/2002.

Trailer brakes

Section 56 of the Vehicle Equipment Regulation says a person may not drive a vehicle that tows a trailer unless the trailer has brakes adequate to control its safe movement, loaded or unloaded. If the trailer breaks away from the towing vehicle, its brakes must be automatically applied at that moment and stay applied for at least 15 minutes. Several trailers are not required to have brakes. A trailer is exempt if brakes were not required when it was made under the federal Motor Vehicle Safety Act. Behind a private passenger vehicle, a trailer with a maximum gross weight of not more than 910 kilograms, or less than half the unladen weight of the towing vehicle, is exempt. Behind a commercial vehicle, a trailer other than a pole trailer is exempt at a maximum gross weight of not more than 2,300 kilograms when that weight is less than half the unladen weight of the towing vehicle. A pole trailer is exempt at not more than 6,800 kilograms on the same half-weight condition. Farm-product trailers have their own lines at 3,650 kilograms. The text read does not use the words safety chain. See the Vehicle Equipment Regulation, AR 122/2009.

Width, height and length

Section 4 of the Commercial Vehicle Dimension and Weight Regulation sets the maximum dimensions on a highway. A truck tractor or a truck, including any load, may not exceed 2.6 metres in width or 4.15 metres in height measured from the highway surface. A truck or bus may not exceed 12.5 metres overall length, and for a truck made after September 1, 1993 the hitch offset to the rear may not exceed 1.8 metres and the effective rear overhang may not exceed 4 metres. A full trailer, including any load, may not exceed 2.6 metres wide or 4.15 metres high, and its trailer length may not exceed 12.5 metres. A semi-trailer is held to the same width and height and to 16.2 metres of trailer length. The regulation sets track width, wheelbase and axle-count rules for each trailer type as well. This is the commercial vehicle text; its application and exemptions are in sections 2 and 3. See the Commercial Vehicle Dimension and Weight Regulation, AR 315/2002, current as of April 1, 2025.

Permits and the safety fitness certificate

The same regulation prices permits for overdimensional and overweight vehicles in section 19: CA$18.75 for a single trip overdimensional permit and CA$75 for a multi-trip overdimensional permit, with a CA$375 fee for a long combination vehicle permit. Separately, section 2 of the Commercial Vehicle Certificate and Insurance Regulation says no person may operate a commercial vehicle used to transport goods on a highway, and registered under the Act for a gross weight of 11,794 kilograms or more, unless the operation is carried out under the authority of a safety fitness certificate. A vehicle registered in another jurisdiction needs a certificate or equivalent authority from that jurisdiction if that jurisdiction requires one. Exemptions in the section include commercial vehicles mainly hauling farm products for a bona fide farmer and 2- or 3-axle vehicles mainly hauling primary forest, lake or river products when the driver or the employer produces them. Part 4.1 of the regulation sets up carrier profiles kept by the Registrar. See the Commercial Vehicle Certificate and Insurance Regulation, AR 314/2002, current as of September 1, 2026.