At a corner where both of your lanes may turn left, which one gives a tractor-trailer the wider arc?

Neither; turn from the curb lane

When is the lane-straddling right turn used?

Only as a last resort on narrow streets

On every right turn in a city with parked cars

When uncoupling, how far should the landing gear be lowered?

Until it touches the ground or is under 2 cm above it

Halfway down, to save time later

Until the trailer lifts off the fifth wheel

Until the trailer is level with the dock

Manitoba Commercial overview

Manitoba Commercial: Turning, backing and coupling (Class 1 and 3)

Off-tracking, right and left turns with button hook, extended approach and lane straddling, backing a tractor-trailer, the Class 1 straight line backing test, draw-bar rules, and Manitoba's coupling and uncoupling steps.

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Turning, backing and coupling (Class 1 and 3) · Question 1Score 0/0

On a right turn, how close to the curb should the trailer's rear wheels stay?

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

Study reference: MPI Professional Driver's Manual (PDF, Dec. 2025), Ch. 3 Additional information for Class 1 and Class 3 drivers — Turning, Backing a tractor and trailer, Connecting vehicles

All 15 questions in this test

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

On a right turn, how close to the curb should the trailer's rear wheels stay?
1. Right against the curb
2. In the centre of the curb lane
3. Within about 1.5 m of the curb
4. Within about 3 m of the curb
Which right-turn method is used when the only room to manoeuvre is inside the intersection?
1. The two-point turn-about
2. The button hook
3. The lane-straddling turn
4. The extended approach
At a corner where both of your lanes may turn left, which one gives a tractor-trailer the wider arc?
1. The left-most lane
2. The lane with fewer vehicles
3. The right-most lane
4. Neither; turn from the curb lane
When is the lane-straddling right turn used?
1. Whenever traffic is light
2. Only as a last resort on narrow streets
3. Only on multi-lane highways
4. On every right turn in a city with parked cars
When uncoupling, how far should the landing gear be lowered?
1. Halfway down, to save time later
2. Until the trailer lifts off the fifth wheel
3. Until it touches the ground or is under 2 cm above it
4. Until the trailer is level with the dock
After the fifth wheel engages, how do you test the coupling?
1. Tug in the lowest gear, then check for gaps and the lock
2. Rock the trailer by hand from the landing gear
3. Drive a short distance at normal speed and listen for noises
4. Release the trailer brakes and coast backward
Approaching a turn with a long unit, which step does MPI recommend?
1. Brake firmly once you are in the turn
2. Shift up as soon as the turn begins
3. Turn on your signal after entering the turn
4. Pick a gear that lets you finish without shifting
Signs allow right turns from two lanes. Which lane should a tractor-trailer use?
1. Both lanes, straddling the line
2. Whichever lane is empty
3. The right-most lane
4. The left-most lane
Except for pole trailers, what is the maximum length of a draw-bar in Manitoba?
1. 5 m
2. 1.83 m
3. 3 m
4. 10 m
In the Class 1 straight line backing test, how far apart are the two lines of cones?
1. 5 m apart
2. 3.7 m apart
3. 18.5 m apart
4. 2.6 m apart
Outside a city, town or village, how far before the intersection should you signal a turn?
1. About 15 m
2. About 500 m
3. About 150 m
4. About 30 m
What determines how much off-track a vehicle has?
1. The air pressure in the tires
2. The distance between front and rear wheels
3. The height and weight of the load on the trailer
4. The size of the engine
Backing a tractor-trailer with your hand at the bottom of the wheel, which way do you move it?
1. Opposite to where the trailer should go
2. In the direction you want the trailer to go
3. Straight up toward twelve o'clock
4. Back and forth quickly to start
Before backing under a trailer, how should the trailer height be set?
1. Level with the top of the tractor tires
2. High enough to clear the fifth wheel completely as you back
3. So it meets the lower half of the fifth wheel's face
4. Low enough to rest on the tractor frame
How many times may you pull ahead during the Class 1 straight line backing test?
1. As many as five times
2. A maximum of three times
3. Unlimited, within ten minutes
4. Only once

Turning, backing and coupling (Class 1 and 3): 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 Types of vehicles and turning (pp. 54–56)

Class 1 covers highway trains, tractor tridems and tractor-trailers; Class 3 covers straight trucks, tractors without a semi-trailer and trucks towing over 4,540 kg.
Class 1 and 3 drivers must also know Section 4 (buses).
Turning sharpness depends on the front-wheel turning radius and the off-track of the rear wheels; the longer the wheelbase, the more off-track.
On a curve right, keep the front wheels near the centre line; on a curve left, near the right edge.
Before turning: adjust speed so you need not brake in the turn, check mirrors and signal, pick a gear that lets you finish without shifting.

Ch. 3 Right and left turns (pp. 57–61)

On right turns the rear wheels must stay on the pavement within about 1.5 m of the curb.
Finish a right turn in the curb lane; if a vehicle is parked within 30 m of the corner in that lane, you may use the next lane if it does not interfere.
Signal about 30 m before the intersection in towns, 150 m outside cities, towns or villages.
Button hook: used when the only room is inside the intersection; steer left near the corner, then right quickly when the trailer pulls away from the curb.
Extended approach: drive well into the intersection before turning; used when the street being entered is wide.
Lane straddling is a last resort, because traffic may try to pass on the inside.
The critical point is when the tractor is at its sharpest angle to the trailer, because mirror vision is limited.
If two lanes may turn right, use the left-most one; if two lanes may turn left, use the right-most one.
On left turns the trailer must stay in the path a car would take, and the rear wheels should stay left of the centre of the intersection.

Ch. 3 Backing and the straight-line backing test (p. 62)

To back a tractor-trailer, turn the steering opposite to where you want the trailer to go (hand at the bottom of the wheel moves the way the trailer should go).
Follow the trailer with the tractor or it will jackknife; the backing path is an S-curve.
Class 1 road test: back straight between two lines of cones 3.7 m apart and 18.5 m long, in five minutes, with at most three pull-ups, stopping within one metre of the last cones.

Ch. 3 Connecting vehicles, coupling and uncoupling (pp. 63–64)

Coupling devices must be strong enough and fastened to main frame parts; a trailer under 900 kg GVWR may couple to a strong part of the frame.
Except for pole trailers, the draw-bar may not exceed 5 m.
Any coupling other than a fifth wheel needs an auxiliary safety chain or cable of equal strength.
Coupling: inspect the tractor (jaws open, release handle unlocked, plate tilted down and greased); back slowly and stop with the fifth wheel ahead of the trailer and the rear axle under its front.
Set the trailer height so it contacts the lower half of the fifth wheel's face.
Engage the fifth wheel, then do a tug test in the lowest forward gear; get out and check there is no gap and the lock is closed.
Connect lines, fully raise the landing gear, supply air with the trailer supply valve and listen for leaks at each gladhand; remove chocks and test the brakes.
Uncoupling: park straight on ground that will hold the trailer, apply both sets of parking brakes, chock if needed.
Lower the landing gear until it touches the ground or is less than 2 cm above it, without raising the trailer.
Unlock the fifth wheel and drive slowly forward until the fifth wheel clears but the frame is still under the trailer; check the trailer is stable, then drive clear.

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