Manitoba Class 3 Exam Prep
Practice Test

A. 2.4 metres

B. 2.6 metres

C. 2.8 metres ✓

D. 3.0 metres

Correct — C. The maximum allowable vehicle width on Manitoba highways is 2.6 metres for most vehicles. Loads of loose hay, straw, or fodder may be up to 3.7 metres wide, but standard vehicle width is strictly limited to protect lane integrity and reduce side-swipe risks.

A. When the speedometer reading differs from actual speed

B. When rear wheels follow a tighter path than front wheels in a turn ✓

C. When the trailer sways at highway speeds

D. When the vehicle drifts to one side on a crowned road

Correct — B. Off-tracking occurs when the rear wheels of a long vehicle cut inside the arc traced by the front wheels during a turn. The greater the wheelbase and number of axles, the more pronounced the off-tracking, which can cause the rear of the vehicle to encroach on adjacent lanes or curbs.

A. Continue driving and monitor the gauge

B. Increase speed to build air pressure faster

C. Pull over safely and investigate before continuing ✓

D. Shift to a lower gear to compensate

Correct — C. A dropping air pressure gauge on a vehicle with air brakes indicates a potential leak. Continuing to drive risks brake failure. The correct response is to pull over safely and identify the cause before resuming the trip, as air brake failure at highway speed can be catastrophic.

A. Accelerate to stabilize the trailer

B. Apply the trailer brakes firmly and steer hard

C. Release the accelerator and avoid braking or steering corrections ✓

D. Swerve to the opposite lane to straighten the load

Correct — C. When a trailer begins to sway, the safest response is to gradually release the accelerator and allow the vehicle to slow naturally without applying brakes or making abrupt steering inputs. Both hard braking and sharp steering can worsen the sway and cause a jackknife or rollover.

A. 50 metres

B. 75 metres

C. 100 metres ✓

D. 150 metres

Correct — C. Manitoba's Highway Traffic Act requires drivers to signal at least 100 metres before making a turn on a highway. This gives following drivers — especially those operating heavy vehicles with longer stopping distances — adequate time to adjust their speed and position.

A. Away from the curb

B. Toward the curb ✓

C. Straight ahead

D. At a 45-degree angle to the road surface

Correct — B. When parking downhill with a curb present, turn the front wheels toward the curb. If the vehicle begins to roll, the curb will stop it. When parking uphill with a curb, turn wheels away from the curb so the vehicle rolls against the curb if it moves.

A. Water extinguisher

B. CO2 or dry chemical extinguisher ✓

C. Foam extinguisher only

D. Sand only

Correct — B. CO2 and dry chemical extinguishers are appropriate for Class B fires involving flammable liquids such as fuel or oil. Water must never be used on these fires as it spreads the burning liquid. Drivers of commercial vehicles should carry an approved extinguisher rated for Class B/C fires.

A. 50 metres

B. 100 metres

C. 150 metres ✓

D. 200 metres

Correct — C. Drivers must not follow within 150 metres of an emergency vehicle that has its lights and siren activated. This distance ensures that the emergency vehicle can stop, back up, or manoeuvre without endangering the following driver, and keeps the path clear for additional emergency vehicles that may be responding.