Saskatchewan Commercial: Vehicle weights and dimensions

Legal length, width and height limits, A, B and C trains, axle definitions, overheight and power lines, red flags, clearance and amber lights, weight systems, spring road bans, permits and weigh scales.

No sign-up
Every answer explained
Independent · not a government site

12 questions
Topic drill

0/12

Vehicle weights and dimensions · Question 1Score 0/0

What is the maximum length of a single vehicle in Saskatchewan without a permit?

Tip: press 1–4 to answer and Enter for the next question.

Study reference: SGI Professional Driver's Handbook (2026-27), Ch. 3 Vehicle weights and dimensions — Interpretation, Vehicle dimensions, Farm equipment, Weight

All 12 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

What is the maximum length of a single vehicle in Saskatchewan without a permit?
1. 15 m
2. 10.5 m
3. 23 m
4. 12.5 m
Your overheight load will be taller than 5.2 m. Whom must you check with before moving it?
1. The nearest weigh scale
2. SGI's Medical Review Unit
3. SaskPower and SaskTel
4. The local fire department
When do spring road bans usually come into effect in Saskatchewan?
1. In January or February
2. In October or November
3. In March or April
4. In May or June
Under the weight and dimension regulations, a bus is a vehicle designed to carry more than how many passengers?
1. 36
2. 24
3. 15
4. 10
What is the maximum length of a B-train?
1. 27.5 m
2. 23 m
3. 26 m
4. 30 m
What is a B-train?
1. A tractor and semi-trailer towing a full trailer hitched with an A-dolly
2. A truck towing a pony trailer with a rigid drawbar
3. A tractor and semi-trailer towing a semi-trailer on a rear fifth wheel
4. A tractor and semi-trailer towing a trailer with a C-dolly
Which warning is required on an over-dimension load during daylight hours?
1. Clearance lights along the edges
2. Red flags at its extremities and edges
3. Reflective tape only on the rear
4. A white light at the rear
Your permit allows a heavier load, but a bridge sign posts a lower weight limit. What applies?
1. The sign applies only at night
2. The posted sign must be obeyed
3. Either one, at the driver's choice
4. The permit overrides the sign
What is the maximum legal width of a vehicle and its load on a provincial highway?
1. 3.05 m
2. 2.06 m
3. 2.4 m
4. 2.6 m
What is the maximum height of a vehicle and load without a permit?
1. 4.15 m
2. 4.5 m
3. 3.85 m
4. 5.2 m
What does a converter dolly do?
1. Lifts an axle off the road when empty
2. Converts a semi-trailer into a full trailer
3. Links two tractors for heavy hauling
4. Converts a tractor into a straight truck
How far apart are the axle centres in a tandem axle group?
1. More than 1 m and not more than 1.85 m
2. Exactly 1.5 m in every case
3. More than 2.4 m and not more than 3.7 m
4. Less than 1 m apart

Vehicle weights and dimensions: key rules to remember

Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗

Ch. 3 Interpretation (pp. 56–63)

Weights and dimensions are set by regulations under The Highways and Transportation Act, 1997; permits are available for oversize or overweight loads.
Posted signs limiting size or weight must always be obeyed, whatever your permit says.
A-train: tractor and semi-trailer towing a second trailer with an A-dolly (single hitch).
B-train: tractor and semi-trailer towing a second semi-trailer on a fifth wheel mounted at the rear of the first.
C-train: second trailer connected with a C-dolly (two parallel arms on two hitches).
A converter dolly (axles, fifth wheel, drawbar) turns a semi-trailer into a full trailer.
A bus is a motor vehicle designed to carry more than 15 passengers.
Tandem axle group: two axles more than 1 m and not more than 1.85 m apart. Tridem: three equally spaced axles with a spread of 2.4–3.7 m.
In an axle group, adjacent axles may differ in weight by no more than 1,000 kg.
A lift axle can raise its wheels off the road.

Vehicle dimensions (pp. 63–66)

Single vehicle: maximum 12.5 m long.
Combinations other than trains: maximum 23 m; A or C train 26 m; B train 27.5 m.
When towing two trailers, the lead trailer needs at least two axles or must be a fifth-wheel or gooseneck trailer.
Maximum width of vehicle and load: 2.6 m; mirrors may extend 30 cm and tie-downs 10 cm beyond that.
House trailers moved between sunrise and sunset: up to 3.05 m wide.
Maximum height: 4.15 m unless a permit says otherwise; know your total height at all times.
Low clearances may be unposted: underpasses, alley fire escapes, tree limbs, canopies, wires, shop doors; snow buildup reduces clearance.
Most power and telephone lines over provincial highways clear 5.2 m; above that, check with SaskPower and SaskTel.
Over-dimension loads: red flags at the extremities by day, clearance lights at night, and amber flashing lights on the cab.
Trucks with rear overhang need care in narrow alleys and tight turns.
Oversize farm equipment may travel between sunrise and sunset, except on certain high-traffic designated highways; the exemption does not cover equipment loaded on a truck or trailer.

Weight (p. 67)

Axle weights and gross weights are separate limits; you may exceed neither the registered weight nor the highway limit.
Saskatchewan has Primary, Secondary and Municipal highway weight systems; primary highways allow heavier gross weights.
Spring road bans usually start in March or April.
Overweight permits are limited to loads that cannot practically be divided.
Trucks must report to weigh scales when a sign directs them.

Study the Vehicle weights and dimensions rules as flashcards →