CLASS D KNOWLEDGE TEST

Non-functional brake lamps are classified as a major defect because they pose a serious safety risk to you and other road users. When a major defect is found:

• Document it properly

• Do not operate the vehicle until the issue has been repaired and verified

Operating a vehicle with major defects violates safety regulations and can lead to penalties or accidents.

A significant defect means the vehicle is not safe to operate. It must be taken out of service immediately and repaired before use, as required by commercial vehicle safety regulations.

According to Canadian Hours of Service regulations:

• After accumulating 13 hours of driving time, a commercial driver must take a minimum of 8 consecutive off-duty hours before driving again.

This rule helps ensure drivers are properly rested to maintain safety on the roads.

When making a right-hand turn, especially if you must cross the center line (such as with large vehicles):

• Signal your intention clearly and early

• Yield to oncoming traffic and pedestrians

• Ensure the turn is made safely and without cutting off others

This is essential for both safety and legal compliance.

• Filling out paperwork or notifying the operator does not directly contribute to the immediate safety of the backing maneuver.

• Instead, safe practices include:

  • Opening windows to hear surroundings

  • Turning off distractions (like phone/radio)

  • Getting out and checking the area

When another driver is attempting to pass you, you are required to:

• Keep to the right of the road or lane

• Maintain or slightly reduce your speed

• Allow the passing vehicle to pass safely

Blocking, speeding up, or swerving left is dangerous and illegal.

The vehicle’s cargo must be inspected and verified as secure before driving, and re-checked within 80 km after beginning the trip or after the cargo is loaded.

This symbol typically appears near truck inspection stations and means:

“When lights are flashing, trucks must enter the inspection station.”

It applies to commercial vehicles, not passenger cars, and is used to monitor vehicle condition, weight, and compliance with safety regulations.

The sign shows a truck tipping over, which is a warning to drivers—especially those operating large or top-heavy vehicles—to reduce speed around curves. It alerts drivers to the risk of rollover if they take the curve too quickly.

This sign is typically found before sharp or elevated curves on highways or ramps.

You should not enter an intersection unless you can completely clear it on the other side. Entering when the road is blocked may result in gridlock or a traffic offense (commonly called “blocking the box”), and can cause collisions or traffic congestion.

The person who cannot be charged with an offence for an overloaded vehicle is typically the receiver of the goods. This is because the responsibility for ensuring that a vehicle is not overloaded generally falls upon the driver, the shipper, and the operator. The driver is in control of the vehicle and is expected to know and comply with weight restrictions. The shipper should ensure that the vehicle’s load complies with legal limits before dispatch. Lastly, the operator, or owner, of the vehicle is responsible for implementing proper procedures to avoid overloading. The receiver usually is not involved in the loading process and hence is less likely to be held responsible for an overloaded vehicle.

Under Ontario’s Highway Traffic Act, the following must be carried in a commercial motor vehicle:

• A readable copy of the CVOR certificate

• Vehicle registration or a verified copy

• Proof of insurance (not necessarily the original, but valid documentation)

However, the Safety Standards Certificate (SSC) is not required to be carried in the vehicle. It is used primarily for vehicle registration or transfer purposes — not for day-to-day operation.

When required to keep a daily log, you must record all periods of duty status, including:

• On duty (driving)

• On duty (not driving)

• Off duty

• Sleeper berth (if applicable)

This ensures compliance with Hours of Service regulations and allows for proper monitoring of rest and driving limits.

By scanning the road ahead, drivers can anticipate potential hazards, make safer decisions, and reduce the risk of dangerous situations. This proactive driving habit is a key element of defensive driving.

If a significant defect is found during inspection, the vehicle is not safe to operate and must not be used until the defect is repaired. This is a strict safety requirement under commercial vehicle inspection regulations.

You should test the brakes right after the vehicle starts moving to ensure they are functioning correctly. This early check helps detect any issues before reaching higher speeds or entering traffic, enhancing safety for you and others on the road.

This symbol—a red circle with a line through a black truck and a white placard or symbol—indicates that vehicles carrying dangerous goods are prohibited from entering or using the marked road, tunnel, or area.

On a multi-lane roadway, it’s important to:

• Maintain a safe following distance

• Be aware of your blind spots, especially when driving large vehicles

• Avoid unnecessary lane changes

This promotes safe and predictable driving, reducing the risk of collisions.

The maximum allowed gross weight of a commercial motor vehicle is determined by factors like:

• Number of axles

• Spacing between axles

• Permitted axle weights (including steering axle)

However, the actual weight of the cargo does not affect the legal maximum—it’s the load that must be adjusted to stay within the permitted gross weight, not the other way around.

So, cargo weight is a variable, not a factor that defines the legal limit.

In Ontario and several other jurisdictions in Canada, commercial motor vehicles (typically those with a gross weight over 11,794 kg) are required to have a speed limiter set to a maximum of 105 km/h to enhance road safety and reduce fuel consumption.

In a roundabout, vehicles already circulating inside have the right-of-way. Drivers approaching the roundabout must yield to traffic already in it before entering.

Both the driver (who performs inspections and reports defects) and the operator (who ensures maintenance and repairs are done) share responsibility for the safe operating condition of a commercial motor vehicle.

A properly completed daily inspection report must include the signature of the driver or the person who completed the report, confirming the inspection was done and any defects were noted.

As a commercial vehicle driver, it is always your responsibility to ensure that the vehicle’s brakes are properly adjusted before and during operation. Faulty or misadjusted brakes are a major safety hazard and a common reason for vehicle out-of-service violations.

When a commercial motor vehicle is disabled on a roadway, you are required to place warning devices such as flares or reflective triangles:

• Approximately 30 meters (100 feet) in front and behind the vehicle

• This alerts other drivers well in advance and helps prevent collisions

Always ensure they are clearly visible to approaching traffic.

In Ontario and most Canadian provinces, the maximum allowable length for a combination vehicle (such as a truck and trailer) is 23 metres (75 feet), unless otherwise specified under special permits or configurations.

In Ontario (and most Canadian jurisdictions), if a load extends more than 1.5 metres (5 feet) beyond the rear of the vehicle:

• During the day, it must be marked with a red flag or marker

• At night, it must be marked with a red light

This ensures the overhanging load is clearly visible to other drivers for safety.

Excessive lash or free play refers to too much movement in the steering wheel before the wheels begin to turn. This can indicate problems such as:

• Worn steering components

• Loose connections

• Improper adjustments

It is a critical safety issue that must be inspected and repaired immediately.

A longer wheelbase increases the off-tracking, meaning the rear wheels follow a tighter path than the front wheels during turns. This is important when maneuvering through tight spaces or intersections.

In Ontario (and across Canada), hazardous materials must be identified using standardized safety labels and placards, as required by the Transportation of Dangerous Goods (TDG) Regulations. These markings indicate the class of dangerous goods (e.g., flammable, corrosive, toxic) to ensure proper handling and emergency response.

In Ontario (and across most Canadian provinces), the maximum allowable width for a commercial motor vehicle, including its load, is 2.6 metres (8.5 feet) — unless a special permit is issued. Exceeding this width without a permit is illegal and unsafe for road travel.

According to the regulations regarding hours of service for commercial motor vehicle drivers, a driver cannot operate a vehicle after accumulating 70 hours of on-duty time within a seven-day period. 

A valid inspection sticker on the vehicle confirms that it has passed the required annual safety inspection and is compliant with Ministry of Transportation (MTO) regulations. This sticker must be clearly visible and up to date.

It indicates a designated truck route, meaning that trucks should follow this path as it is approved for their use

ABS (Anti-lock Brake Systems) are designed to prevent the wheels from locking up during braking, which helps maintain steering control. However, ABS does not necessarily reduce stopping distance, especially on loose or slippery surfaces—it mainly helps the driver maintain control during emergency braking.

You must always carry the relevant inspection schedule and daily inspection report when operating a commercial vehicle. This is a legal requirement to ensure the vehicle is roadworthy and that authorities can verify the inspection was properly completed.

When approaching a roundabout, it is important to:

• Choose the correct lane based on your intended exit

• Yield to traffic already in the roundabout

• Enter and exit smoothly and safely

Stopping unnecessarily, speeding up to enter, or crowding another vehicle inside the roundabout can be dangerous and is not recommended.

ABS (Anti-lock Brake Systems) are designed to:

• Prevent wheel lock during hard braking

• Help maintain steering control

• Improve stability, especially on slippery surfaces

However, ABS does not always reduce stopping distance—particularly on loose gravel or snow—though it helps the driver stay in control during emergency braking.

A daily inspection report is valid for a maximum of 24 hours from the time the inspection is completed. After that, a new inspection must be conducted and documented before the vehicle is operated again.

In Ontario (and most Canadian provinces), the maximum legal height for a commercial motor vehicle, including its load, is 4.15 meters (13.6 feet). Exceeding this height may require special permits and route planning.

Even if no defects are found during a daily vehicle inspection, you are still required to complete and sign the report to confirm the inspection was performed and the vehicle is safe to operate.

After wheels are serviced (e.g., removed and reinstalled), it’s critical to:

• Re-torque or check wheel fastener tightness after driving 80 to 160 km

• This ensures the wheels remain properly secured and helps prevent wheel separation, which is a serious safety hazard.

If your vehicle slows down while ascending a steep hill, you should:

• Continue driving safely

• Turn on your four-way flashers to alert other drivers that you are moving slowly

This improves visibility and safety for everyone on the road, especially in high-traffic or low-visibility conditions.

It shows different weight limits (in tonnes) for different types of vehicle configurations:

• Single-unit trucks

• Truck and trailer combinations

• Multi-trailer configurations

Drivers must comply with these limits when crossing bridges to prevent overloading and structural damage.

On a highway, commercial motor vehicles traveling in the same direction must maintain a following distance of at least 200 feet (60 meters) from each other. This rule helps ensure safe stopping distance and reduces the risk of rear-end collisions, especially in emergency situations.

This sign warns drivers—especially those operating heavy or commercial vehicles—to prepare for a steep downhill grade ahead. Drivers should:

• Shift to a lower gear

• Control speed

• Use engine braking

For rear tires on a commercial motor vehicle, if the tread depth in two adjacent grooves is less than 1.5 mm (or 0.06 inches), the tire fails inspection. This is a minimum legal requirement to ensure adequate traction and safe operation.

Excessive lash or free play in the steering (more than 10 cm or 4 inches) is a serious safety concern. It can indicate worn or damaged components, and the vehicle should not be driven until inspected and repaired.

The main reason for looking under the hood during a pre-trip inspection is to check fluid levels (e.g., engine oil, coolant, brake fluid, windshield washer fluid) to ensure the vehicle is safe and ready for operation.

Before descending a steep hill, it’s safe and wise to reduce your speed and shift to a lower gear. This helps maintain control of the vehicle using engine braking, reducing reliance on the brakes and preventing brake overheating.

At a truck inspection station, officials primarily check for:

• Compliance with size and weight regulations (height, length, width)

• Mechanical safety

• Driver documentation and hours of service

While cleanliness or sealed cargo may be noted, they are not primary inspection criteria.

When operating a large vehicle, it’s essential to always be aware of its height and width to avoid collisions with bridges, overpasses, and other overhead or narrow obstacles. This is critical for safety and to prevent damage to infrastructure and the vehicle.

A police officer or other authorized enforcement official can require a commercial vehicle driver to report to a truck inspection station for a safety check. This is part of routine enforcement to ensure vehicles meet all safety and regulatory standards.

When you discover a minor defect while traveling, you are required to:

• Record it in the daily inspection report

• Notify the operator (vehicle owner or carrier)

• Monitor the issue to ensure it doesn’t worsen or become unsafe

This ensures proper documentation and allows the issue to be addressed promptly.

This yellow diamond warning sign shows a truck entering from the right, often from an industrial site or loading area. It warns drivers to be alert for slow-moving or heavy trucks merging into traffic from the right side.

When making a right turn, especially with a large vehicle or trailer, you should:

• Pull forward into the intersection before beginning your turn

• This creates a wider turning angle and helps prevent the rear wheels from off-tracking over the curb or sidewalk

The other options (horn, flashers, brake lights) are not effective in preventing curb strikes.

While others may assist in loading or planning, it is ultimately the driver’s legal responsibility to ensure that all cargo is properly secured before and during transport. This includes checking:

• That the load is stable and secure

• That tie-downs and safety equipment are in place and functioning

• That the vehicle is safe to operate

Failing to do so can result in fines, vehicle impoundment, or serious accidents.

To properly conduct a daily vehicle inspection, you must follow a structured method, such as using an inspection checklist or schedule approved by your jurisdiction. This ensures that no critical components are overlooked and helps maintain vehicle safety and compliance.

Straight backing is the simplest and safest backing technique because:

• The vehicle remains aligned with minimal steering input

• Visibility is better, especially when using mirrors

• It reduces the risk of jackknifing or hitting obstacles

While other techniques are necessary in tighter spaces, straight backing is preferred whenever possible.

Before a newly licensed or learning driver operates a commercial motor vehicle, they must be accompanied by a qualified driver who holds the appropriate class of license for that vehicle. This ensures safety and compliance during training or probationary periods.

A broken clearance light is typically classified as a minor defect during a daily inspection. It must be reported, but the vehicle may still be operated with caution until the defect is repaired, depending on the specific regulations.

An authorized ministry office or the police can conduct a safety inspection anywhere and at any time, especially if they have reasonable grounds to believe there may be a safety issue.

For front tires, if the tread depth in two adjacent grooves is less than 3.0 mm (0.12 inches), the tire fails the safety inspection according to most commercial vehicle safety standards.

Only a certified tire installer or qualified technician has the proper training and authority to safely and legally replace a tire on a commercial or business vehicle. This ensures:

• Correct procedures are followed

• Proper torque and inflation

• Compliance with safety and regulatory standards

Improper tire replacement can lead to safety hazards and legal violations.

Before reversing a commercial vehicle, especially a large one, it’s crucial to get out and look (GOAL) to ensure the path is clear of obstacles, people, or hazards. Relying only on mirrors or signals is not sufficient for safe backing.

A roundabout’s central apron, also called a “truck apron,” is designed to accommodate larger vehicles, particularly trucks and trailers, by providing extra space for their back wheels to navigate the curve safely, essentially allowing them to “take up the middle of the road” while turning. 

• The red circle with a slash over the truck means no trucks allowed.

• The text “OVER 6.5 m” specifies the restriction applies to trucks longer than 6.5 meters.

• The downward arrow shows the restriction applies to the lane directly below the sign.

So, trucks over 6.5 m in length are prohibited from using this lane.

• The green circle around the truck symbol indicates a permissive sign in Ontario.

• It means that trucks are permitted on the road or route where the sign is posted.

This is commonly referred to as a designated truck route or truck-permitted area.

Properly balancing the load is essential to ensure safe handling, braking, and stability of the commercial vehicle. An unbalanced load can lead to tipping, poor steering control, and increased stopping distances.

You are responsible for ensuring that everything on the vehicle — including the main load and any accessories (e.g., wheel chocks, fuel cans, tarps) — is securely fastened to prevent shifting or falling during transport.

To safely complete a turn, especially with a large or long vehicle, you should:

• Drive slowly

• Monitor the rear wheels

• Avoid curbs, edges, and obstacles

This helps prevent collisions and ensures better control of the vehicle throughout the turn.

• The red circle with a diagonal line across a truck icon is the standard “No Trucks” symbol.

• It means trucks are prohibited from entering or using the road or area where this sign is posted.

To legally transport hazardous materials in Canada, you must receive proper training and certification under the Transportation of Dangerous Goods (TDG) Regulations. This training is typically provided and documented by your employer, and you must carry proof of training while transporting hazardous goods.

Sleeper berth time is considered off-duty, not on-duty.
The following are considered on-duty activities:

• Operating a vehicle

• Filling and emptying (loading/unloading)

• Carrying out a daily examination (inspection)

When signal lights are flashing at a railroad crossing, you must stop at least 5 metres (16 feet) from the nearest rail. This is required by law in Ontario and many other jurisdictions in Canada.

Letting the clutch slide or slip excessively (also called “riding the clutch”) can cause it to overheat, leading to premature wear or damage. Proper clutch use is essential to avoid costly repairs and maintain vehicle performance.

• The red circle with a slash over the truck icon is a universal symbol for “No Trucks.”

• The black downward arrow shows that the restriction applies to the lane directly below the sign.

So, trucks are prohibited from using the lane beneath this sign.

The gross weight of a commercial motor vehicle refers to the combined weight of the vehicle itself plus its load, including fuel, passengers, and any cargo. This is important for compliance with weight limits and safe operation.