Quebec Class 1 key terms

Octagonal red sign with white lettering that requires a complete halt at the stop line or edge of the intersection before proceeding, yielding to pedestrians and cross traffic. Rolling stops are prohibited and penalized.

Solid white transverse line marking the exact point where a vehicle must stop for a stop sign, red light or pedestrian crossing. If absent, stop before the crosswalk or intersection edge.

Inverted triangular sign requiring the driver to slow and yield to traffic on the intersecting road, stopping only if necessary. Unlike a stop sign, a full stop is not always mandatory.

Amber traffic signal warning that the light is changing to red. A driver must stop unless stopping cannot be done safely; entering on amber to beat the red is an offence.

Flashing red signal at an intersection meaning the driver must come to a complete stop, yield, and proceed only when safe, similar to a stop sign. Often used at malfunctioning signals.

Right-of-way rule determining which vehicle may proceed first. In Quebec, at uncontrolled intersections the vehicle on the right generally has priority, and drivers must yield when turning left across oncoming traffic.

Left turn maneuver in which the driver must yield to oncoming traffic, pedestrians and cyclists, signal in advance, and complete the turn into the correct lane without cutting the corner.

Gap maintained behind the vehicle ahead, commonly at least three seconds in good conditions and more for heavy vehicles or poor weather. It provides time to react and stop safely.

Total distance a vehicle travels from the moment the driver perceives a hazard until it stops, combining perception-reaction distance and braking distance. It increases with speed, weight and slippery surfaces.

Use of engine compression, often with an engine brake or retarder, to slow a heavy vehicle on long downgrades without overheating the service brakes. Also called engine braking or Jake brake.

Downhill grade where a heavy vehicle gains speed quickly. Drivers must select a low gear before descending, use engine braking and avoid continuous service brake application to prevent brake fade.

Loss of braking effectiveness caused by overheating of brake drums or discs during prolonged or repeated application, common on long descents. Recovery requires cooling time and lower speed.

Systematic pre-trip walk-around check of tires, lights, brakes, coupling devices, cargo and fluid levels before driving a heavy vehicle. Defects must be corrected or reported before departure.

Air brake check performed with the engine off and system charged, observing pressure gauges for excessive drop over a set period. It confirms the system holds pressure and has no leaks.

Storage tank that holds compressed air for the brake system, supplying the service brakes and emergency spring brakes. It must be drained regularly of moisture and kept at proper pressure.

Backup braking system, typically spring-applied parking brakes that engage automatically when air pressure drops below a safe level. It allows controlled stopping if service brakes fail.

Mechanism that holds a parked vehicle stationary, often spring brakes released by air pressure. It must be fully applied before leaving the cab and tested during pre-trip inspection.

Air pressure inside a tire, checked cold against manufacturer specifications. Incorrect pressure causes uneven wear, heat buildup and blowout risk, especially on heavily loaded commercial vehicles.

Loading a vehicle beyond its legal gross, axle or tire weight limits. Overloading reduces braking and steering performance and exposes the carrier to fines and out-of-service orders.

Weight of the cargo a vehicle can legally carry, calculated as gross vehicle weight rating minus curb weight. It must be distributed so no axle or tire limit is exceeded.

Placement and distribution of cargo so weight is balanced across axles and kept low and centered. Poor distribution can overload an axle, affect steering or cause a rollover.

Use of straps, chains, binders and blocking to secure cargo so it cannot shift, fall or blow off during transport. Securement devices must meet working load limits and be regularly inspected.

Legal limits on driving and on-duty time, with required rest periods, designed to prevent driver fatigue. Records must be kept accurately and made available for inspection.

Daily log or electronic record documenting driving, on-duty, off-duty and sleeper-berth time. It must be current, accurate and retained for the period required by regulation.

Physical and mental tiredness that impairs reaction time, judgment and attention. It is managed through adequate sleep, scheduled breaks, limits on driving hours and recognition of warning signs.

Area around a heavy vehicle that the driver cannot see directly or through mirrors, including large zones beside and behind the trailer. Mirrors and shoulder checks help manage it.

Substances classified as explosive, flammable, toxic, corrosive, radioactive or otherwise hazardous for transport. Their handling, packaging, labelling and documentation are strictly regulated.

Diamond-shaped placard affixed to a vehicle showing the hazard class of the dangerous goods carried. It warns emergency responders and other road users of the risk.

Shipping paper describing dangerous goods in transport, including proper shipping name, class, quantity and emergency contact. It must accompany the shipment and be accessible to the driver.

Skill of scanning ahead, anticipating risky situations and identifying escape options before a hazard becomes an emergency. It underpins defensive driving and timely braking decisions.

Loss of tire grip causing the vehicle to slide, often on ice, snow or wet pavement. Correct response is to ease off the accelerator and brakes and steer smoothly in the intended direction.

Marked area near a school where reduced speed limits apply during posted hours and children may cross unexpectedly. Drivers must slow down and watch for pedestrians and crossing guards.

Marked crosswalk where pedestrians have priority. Drivers must yield, stop before the crossing and never pass a vehicle stopped at a crosswalk for a pedestrian.

Maximum legal speed posted for a road or zone, which may be lower for heavy vehicles or in construction and school zones. Exceeding it reduces reaction time and increases stopping distance.

Paved or unpaved shoulder beside the travel lane. It is not a driving lane; pulling onto it is permitted only for emergencies, and soft shoulders can cause a heavy vehicle to tip.

Connection between tractor and trailer, including the fifth wheel, kingpin and safety devices. It must be inspected and locked before departure to prevent trailer separation.