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Alberta Class 4 study materials
Alberta Class 4 study resources

Alberta Class 4 practice questions

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Question 1Class 4 knowledge and rules of the road

Under Alberta's traffic law, what does a Class 4 licence permit a driver to operate in addition to the vehicles allowed by a Class 5 licence?

  1. A semi-trailer tractor unit pulling a 53-foot trailer
  2. Any vehicle with air brakes regardless of weight
  3. A motorcycle over 400 cc
  4. A taxi, ambulance, or small bus designed to carry a limited number of passengers Correct answer.

Explanation

A Class 4 licence builds on the Class 5 privilege by allowing the driver to operate taxis, ambulances, and small buses within the passenger limits set for that class. It does not extend to heavy tractor-trailers, air-brake equipped trucks of any weight, or motorcycles, which require separate classes or endorsements.

Question 2Class 4 knowledge and rules of the road

A school bus driver in Alberta is stopped at a railway crossing with the door open and hazard lights active. What is the purpose of this procedure?

  1. To warn oncoming vehicles that students are boarding
  2. To allow the driver to listen for an approaching train before proceeding Correct answer.
  3. To test the bus's electrical system before departure
  4. To signal other traffic that the bus is about to reverse

Explanation

At a railway crossing, a school bus must stop, open the door, and turn on hazard lights so the driver can look and listen for trains without the engine and closed cab masking the sound. The bus proceeds only when the driver is certain no train is approaching.

Question 3Class 4 knowledge and rules of the road

When a school bus has its red lights flashing and stop arm extended on an undivided highway, what must a driver approaching from the opposite direction do?

  1. Stop until the red lights stop flashing Correct answer.
  2. Sound the horn and proceed if no children are visible
  3. Slow to 30 km/h and pass carefully
  4. Change lanes and continue at the posted limit

Explanation

On an undivided road, traffic in both directions must stop for a school bus displaying flashing red lights and an extended stop arm. The stop remains in effect until the red lights are turned off, protecting children crossing the road.

Question 4Class 4 knowledge and rules of the road

What is the maximum number of passengers a bus may carry under a Class 4 licence in Alberta, assuming no other endorsement applies?

  1. No limit
  2. 36 passengers
  3. 16 passengers
  4. 24 passengers Correct answer.

Explanation

The Class 4 licence covers buses designed to carry up to 24 passengers. Larger buses, such as those seating more than 24, require a Class 2 licence. This passenger threshold distinguishes the small-bus privilege from full commercial bus operation.

Question 5Class 4 knowledge and rules of the road

Before a commercial driver begins a trip, which pre-trip inspection item is most critical for a vehicle equipped with air brakes?

  1. Verifying the radio and GPS are functioning
  2. Checking that the interior lights work
  3. Confirming the fuel tank is more than half full
  4. Checking the air pressure build-up and testing for leaks Correct answer.

Explanation

Air-brake systems must build pressure within the specified time and hold it without excessive leakage, because a pressure loss can disable the brakes. A pre-trip inspection therefore focuses on compressor build-up, governor cut-out, and leak-down tests before the vehicle moves.

Question 6Class 4 knowledge and rules of the road

A driver operating a vehicle with air brakes notices the low-pressure warning buzzer sounds while driving. What should the driver do?

  1. Continue driving and monitor the gauge
  2. Stop safely as soon as possible and investigate Correct answer.
  3. Pump the brake pedal repeatedly to build pressure
  4. Shift to a lower gear and increase speed

Explanation

The low-pressure warning indicates the air system has dropped below a safe operating level, which can lead to brake failure. The driver must bring the vehicle to a safe stop and investigate rather than continue, because continued operation risks a runaway or loss of braking.

Question 7Class 4 knowledge and rules of the road

What is the required following distance for a school bus carrying passengers under normal conditions in Alberta?

  1. At least six seconds
  2. At least four seconds Correct answer.
  3. At least two seconds
  4. At least ten seconds

Explanation

Commercial and passenger-carrying vehicles are expected to maintain a following distance of at least four seconds under normal conditions. This gives the heavier vehicle more room to stop and reduces the risk of rear-ending or abrupt braking that could injure standing or seated passengers.

Question 8Class 4 knowledge and rules of the road

A taxi driver is picking up a passenger on a busy street. Where should the driver stop to load the passenger safely?

  1. In the travel lane with hazard lights on
  2. In a no-stopping zone if the passenger is elderly
  3. At the curb or as close to the curb as practical Correct answer.
  4. Across an intersection to avoid blocking traffic

Explanation

Passengers should be loaded and unloaded at the curb or as close to it as possible so they are not exposed to moving traffic. Stopping in a travel lane or a prohibited zone creates a hazard and violates traffic rules.

Question 9Class 4 knowledge and rules of the road

When must a commercial driver complete a written trip inspection report?

  1. Only after a collision
  2. Once every thirty days
  3. Only when a defect is discovered
  4. Before the first trip of each day the vehicle is operated Correct answer.

Explanation

Drivers of regulated commercial vehicles must conduct and record a trip inspection before the first trip of each day the vehicle is used. The report documents the condition of key components and any defects found, supporting maintenance and safety compliance.

Question 10Class 4 knowledge and rules of the road

An ambulance driver is responding to an emergency call with lights and siren. How should the driver approach a red light at an intersection?

  1. Turn off the siren and wait for other traffic to move
  2. Proceed through without slowing if the siren is on
  3. Stop and wait for the light to turn green
  4. Slow down, ensure the intersection is clear, then proceed with caution Correct answer.

Explanation

Emergency vehicles may proceed through a red light only after slowing enough to confirm the intersection is clear and other traffic has yielded. Lights and siren grant a privilege to proceed with caution, not an absolute right of way, so the driver remains responsible for a safe crossing.

Question 11Class 4 knowledge and rules of the road

A bus driver must unload passengers where there is no curb. What is the safest practice?

  1. Ask passengers to jump from the rear emergency door
  2. Position the bus so passengers can exit away from moving traffic and cross only when safe Correct answer.
  3. Have passengers exit into the traffic lane while the driver watches
  4. Unload only after all traffic has stopped in both directions

Explanation

Without a curb, the driver should position the bus and direct passengers so they exit onto a safe area away from moving traffic, then cross only when it is clear. The driver's duty is to protect passengers from being struck during boarding and alighting.

Question 12Class 4 knowledge and rules of the road

What does a flashing yellow light at a railway crossing with no gates require a school bus driver to do?

  1. Turn around and find another route
  2. Stop, then proceed when safe Correct answer.
  3. Proceed without stopping if no train is visible
  4. Stop only if the crossing arm is down

Explanation

A flashing yellow signal at a railway crossing warns of an approaching train, and a school bus must stop and confirm the track is clear before proceeding. The stop-and-listen procedure applies even when no gates are present.

Question 13Class 4 knowledge and rules of the road

A commercial driver is descending a long steep grade. Which technique best controls speed and protects the brakes?

  1. Ride the brakes continuously to hold a steady speed
  2. Accelerate to clear the grade quickly
  3. Shift to neutral to coast down the grade
  4. Select a lower gear before the descent and use engine braking Correct answer.

Explanation

Selecting a lower gear before a long descent lets engine braking hold the vehicle back and prevents the brakes from overheating. Continuous brake use can cause fade and loss of stopping power, so the gear should be chosen before the grade begins.

Question 14Class 4 knowledge and rules of the road

When a commercial vehicle is involved in a collision that causes injury, what must the driver do first?

  1. Leave the scene to call the company dispatcher
  2. Stop, render assistance, and report the collision to police Correct answer.
  3. Exchange insurance information only if the other driver asks
  4. Continue to the destination and report later

Explanation

The driver must stop at the scene, provide assistance to injured persons, and report the collision to police as required by law. Fleeing or delaying the report can result in serious charges, and the duty to stop and assist comes before any administrative reporting.

Question 15Class 4 knowledge and rules of the road

A driver with a Class 4 licence is convicted of a serious driving offence. What is the most likely consequence for the licence?

  1. Suspension or cancellation of the licence under the demerit and safety program Correct answer.
  2. A warning letter only, with no record
  3. Automatic upgrade to a Class 2 licence
  4. No effect because Class 4 is a commercial privilege

Explanation

Commercial drivers are subject to demerit point and safety-monitoring programs, and accumulating serious convictions can lead to suspension or cancellation of the licence. The privilege to drive commercial vehicles is more strictly regulated than a basic Class 5 licence.

Question 16Class 4 knowledge and rules of the road

A taxi driver is asked to transport a passenger who appears intoxicated and is aggressive. What is the safest course of action?

  1. Ask other passengers to restrain the person
  2. Accept the trip and drive quickly to the destination
  3. Refuse the trip and ask the passenger to leave the vehicle Correct answer.
  4. Lock the doors and drive to a police station with the passenger inside

Explanation

A driver may decline to transport a passenger who poses a safety risk to the driver or others. Refusing the trip and asking the person to exit avoids a confrontation inside a moving vehicle and protects everyone involved.

Question 17Class 4 knowledge and rules of the road

Under the hours-of-service rules for commercial drivers, why are limits placed on driving time and required off-duty periods?

  1. To limit the number of vehicles on the road at night
  2. To increase company revenue by scheduling more trips
  3. To reduce fatigue-related collisions by ensuring adequate rest Correct answer.
  4. To standardize fuel consumption across fleets

Explanation

Hours-of-service limits exist to prevent driver fatigue, which impairs judgment and reaction time and is a major cause of commercial vehicle collisions. Mandatory off-duty periods ensure drivers obtain rest before operating again.

Question 18Class 4 knowledge and rules of the road

A school bus driver is approaching a stop where children are waiting on the shoulder. What should the driver do before opening the door?

  1. Check mirrors and ensure traffic has stopped in both directions Correct answer.
  2. Turn off the red lights to avoid delaying traffic
  3. Signal the children to run across the road
  4. Sound the horn and open the door immediately

Explanation

Before opening the door, the driver must confirm through mirrors that traffic in both directions has stopped and that children are in a safe position. Only then should the door open and the stop arm deploy, so children are not exposed to moving vehicles.

Question 19Class 4 knowledge and rules of the road

A driver must back a large bus into a loading bay. Which practice is safest?

  1. Sound the horn once and back without further checks
  2. Rely only on the rear camera and skip mirror checks
  3. Use a spotter and check mirrors continuously while backing slowly Correct answer.
  4. Back quickly to minimize time in the roadway

Explanation

Backing a large vehicle with significant blind spots requires a spotter and continuous mirror checks while moving slowly. The spotter can see areas the driver cannot, and slow movement gives time to stop if a hazard appears.

Question 20Class 4 knowledge and rules of the road

A bus carrying passengers must make an emergency stop on a highway shoulder. What is the driver's priority after stopping?

  1. Turn off all lights to avoid attracting attention
  2. Keep passengers inside with doors closed and set out warning devices Correct answer.
  3. Immediately release all passengers onto the shoulder near the travel lane
  4. Reverse back onto the highway when traffic clears

Explanation

After an emergency stop, the driver should keep passengers inside where they are protected, activate hazard lights, and place warning triangles behind the vehicle. Releasing passengers next to a live travel lane exposes them to being struck.

Question 21Class 4 knowledge and rules of the road

A commercial driver's air-brake system loses pressure on a downhill grade. What is the correct sequence of actions?

  1. Downshift, use engine braking and the emergency spring brakes, and steer to a safe runoff Correct answer.
  2. Apply the parking brake only and continue at speed
  3. Turn off the engine and coast to the bottom
  4. Pump the brakes rapidly while accelerating

Explanation

If air pressure is lost, the spring brakes will apply automatically, and the driver should downshift, use engine braking, and steer toward a runaway lane or safe runoff. Maintaining control and reducing speed gradually is essential on a grade.

Question 22Class 4 knowledge and rules of the road

A driver is operating a small bus at night in fog. Which combination of actions best maintains safety?

  1. Use hazard lights while driving at the speed limit
  2. Use low beams, reduce speed, and increase following distance Correct answer.
  3. Turn off headlights to reduce glare
  4. Use high beams and maintain normal speed

Explanation

In fog, low beams reduce glare reflected back at the driver, and reducing speed with a longer following distance compensates for limited visibility. High beams worsen visibility by reflecting off the fog.

Question 23Class 4 knowledge and rules of the road

A driver holding a Class 4 licence wants to add a school bus endorsement. What additional requirement applies?

  1. Only a written test on bus routes is required
  2. The driver must meet the school bus endorsement requirements, including any required training and records checks Correct answer.
  3. A Class 1 licence must be obtained first
  4. No additional requirement is needed for a Class 4 driver

Explanation

Driving a school bus requires a specific endorsement on top of the Class 4 licence, including required training, a clean driving record check, and any additional testing. The endorsement ensures drivers meet the higher safety standard for transporting children.

Question 24Class 4 knowledge and rules of the road

When a commercial driver checks the vehicle's tires during a pre-trip inspection, which condition requires the vehicle to be taken out of service?

  1. A tire with adequate tread but slightly low pressure
  2. A tire with a deep cut exposing the cord Correct answer.
  3. A tire with normal wear on the outer edge
  4. A tire with a small amount of road dust

Explanation

A tire with a cut deep enough to expose the cord is structurally compromised and cannot be safely operated, so the vehicle must be removed from service until repaired. Tread depth and pressure are also checked, but exposed cord indicates imminent failure risk.

Question 25Class 4 knowledge and rules of the road

A commercial driver is following a smaller vehicle that suddenly brakes hard. What does the four-second following rule help the driver do?

  1. Guarantee the vehicle will stop in time in all conditions
  2. Provide enough time and distance to react and stop behind the vehicle Correct answer.
  3. Reduce fuel consumption on the highway
  4. Allow the driver to pass on the shoulder if needed

Explanation

The four-second rule gives a heavier vehicle enough time and distance to perceive a hazard, react, and brake without striking the vehicle ahead. It is a minimum margin, not a guarantee, and should be increased in poor weather or with a heavy load.

Question 26Class 4 knowledge and rules of the road

Under Alberta law, which document must a Class 4 driver carry at all times while operating a commercial passenger vehicle?

  1. A valid driver's licence of the correct class Correct answer.
  2. A copy of the vehicle insurance only
  3. A medical certificate only
  4. A letter from the vehicle owner

Explanation

Alberta requires every driver to hold and carry a valid operator's licence of the class that matches the vehicle being driven. The licence is the primary proof of authority to drive, and driving without it in your possession is an offence. Insurance and registration are vehicle documents, but they do not replace the licence requirement.

Question 27Class 4 knowledge and rules of the road

A Class 4 driver is about to start a shift in a 24-passenger commercial bus. Which check belongs in the daily pre-trip inspection?

  1. Confirm the radio station presets
  2. Review the previous week's fuel receipts
  3. Check the fare box coin level
  4. Test the horn, wipers, lights, and service brakes Correct answer.

Explanation

A pre-trip inspection confirms the safety equipment and systems the driver relies on during the trip are working. Horn, wipers, lights, and brakes are all safety-critical items that must be checked before moving. Administrative records and comfort items do not affect the safe operation of the vehicle.

Question 28Class 4 knowledge and rules of the road

While driving a small commercial bus in steady rain, the driver notices the wipers are smearing and visibility drops. What is the safest first action?

  1. Ignore it until the next scheduled stop
  2. Switch on the high beams and continue at the same speed
  3. Slow down and pull over to a safe place to deal with the wipers Correct answer.
  4. Speed up to clear the windshield with airflow

Explanation

When visibility is reduced, the driver must reduce speed and restore clear vision before continuing. Stopping in a safe location lets the driver clean or repair the wipers and check the washer fluid. Continuing at speed with poor visibility increases the risk of a collision with passengers on board.

Question 29Class 4 knowledge and rules of the road

A school bus driver stops to pick up children on a road with two-way traffic and activates the red flashing lights. What must oncoming traffic do?

  1. Stop only if a stop arm is extended
  2. Slow to 30 km/h and pass with caution
  3. Stop until the red lights are turned off Correct answer.
  4. Sound the horn and continue at the posted limit

Explanation

In Alberta, when a school bus displays alternating red flashing lights, traffic in both directions on an undivided road must stop. Vehicles may proceed only after the red lights stop flashing. This protects children who may be crossing the road around the bus.

Question 30Class 4 knowledge and rules of the road

A taxi driver with a Class 4 licence is driving at night and feels drowsy. What is the safest action?

  1. Drink coffee and keep driving without stopping
  2. Increase speed to finish the shift sooner
  3. Pull over in a safe, legal spot and rest before continuing Correct answer.
  4. Open a window and turn up the music

Explanation

Fatigue seriously impairs reaction time and judgment, and the only reliable remedy is rest. The driver should stop in a safe and legal location and not resume until alert. Fresh air, music, or caffeine are temporary measures that do not restore safe driving ability.

Question 31Class 4 knowledge and rules of the road

What is the maximum number of passengers a Class 4 licence holder may carry in a vehicle operated under that class?

  1. Up to 36 passengers
  2. Up to 15 passengers
  3. There is no passenger limit
  4. Up to 24 passengers Correct answer.

Explanation

Alberta's Class 4 licence covers operating taxis, ambulances, and buses designed to carry up to 24 passengers. Larger buses fall under Class 2 authority. Knowing the class limit prevents a driver from operating a vehicle beyond their licence authority.

Question 32Class 4 knowledge and rules of the road

A bus driver is approaching a pedestrian crosswalk where a person is waiting to cross. What is the driver's obligation?

  1. Wave the pedestrian across while rolling forward
  2. Sound the horn to warn the pedestrian to wait
  3. Proceed if no other vehicles are present
  4. Stop and yield the right of way to the pedestrian Correct answer.

Explanation

Drivers must yield to pedestrians at crosswalks and must not proceed until the pedestrian has safely crossed. A large vehicle needs extra stopping distance, so an early, complete stop is the safe choice. Motioning a pedestrian across while the vehicle creeps forward creates confusion and danger.

Question 33Class 4 knowledge and rules of the road

Before a commercial bus pulls away from a curb into traffic, which practice best protects other road users?

  1. Accelerate quickly to merge ahead of traffic
  2. Assume other drivers will slow down for a bus
  3. Signal, check mirrors and blind spots, then move when clear Correct answer.
  4. Rely on the backup camera alone

Explanation

Pulling out requires signalling your intention and confirming the space is clear using mirrors and shoulder checks. Large vehicles have significant blind spots, so a direct look is essential. Assuming others will yield or rushing the merge can cause a collision.

Question 34Class 4 knowledge and rules of the road

A driver holding a Class 4 licence is convicted of impaired driving. What is the most likely effect on the licence?

  1. The driver may continue driving until the next renewal
  2. Only a small fine applies with no licence change
  3. The licence is suspended and the driver may face a longer prohibition Correct answer.
  4. The licence is automatically upgraded to Class 2

Explanation

Impaired driving is a serious offence that triggers licence suspension and possible further prohibition, plus fines and other penalties. Commercial-class drivers face heightened consequences because they carry passengers. Driving during a suspension is itself an offence.

Question 35Class 4 knowledge and rules of the road

During a pre-trip inspection of a commercial bus, a driver finds a brake line with a slow fluid leak. What should the driver do?

  1. Note the leak and check it again at the end of the shift
  2. Reduce speed and drive with extra caution
  3. Top up the fluid and start the route
  4. Remove the vehicle from service until the leak is repaired Correct answer.

Explanation

Any defect that affects braking makes the vehicle unsafe and it must not be operated until repaired. A leaking brake line can fail completely under load, especially with passengers aboard. Recording the defect and continuing exposes everyone in the vehicle to serious risk.

Question 36Class 4 knowledge and rules of the road

A commercial driver is being overtaken by another vehicle on a two-lane highway. What is the correct response?

  1. Accelerate to prevent the pass
  2. Maintain speed and position and allow the pass to finish Correct answer.
  3. Flash high beams to warn oncoming traffic
  4. Move onto the shoulder to make room

Explanation

When being overtaken, the law requires the driver to keep a steady speed and position so the passing driver can complete the manoeuvre safely. Accelerating forces the other driver to stay in the opposing lane longer. Moving onto the shoulder is unpredictable and can cause a loss of control.

Question 37Class 4 knowledge and rules of the road

A bus driver must stop at a railway crossing with no gates and flashing red lights. What is the required action?

  1. Proceed if the crossing arm is up
  2. Stop only if a train is visible
  3. Slow to 20 km/h and cross without stopping
  4. Stop, look both ways, and proceed only when the lights stop and the track is clear Correct answer.

Explanation

Flashing red lights at a railway crossing require a complete stop, and the driver must confirm no train is approaching before crossing. Buses carrying passengers must stop at all railway crossings unless a signal clearly permits otherwise. Proceeding on a slow roll or a visual guess is unsafe.

Question 38Class 4 knowledge and rules of the road

A driver of a large bus is following a truck on a gravel road and dust reduces visibility. What is the best action?

  1. Move closer so the truck's lights stay visible
  2. Turn on high beams and keep the same gap
  3. Pass immediately on the shoulder
  4. Increase following distance well beyond the normal gap Correct answer.

Explanation

Dust reduces visibility and lengthens stopping distance, so the driver should drop back to keep a safe margin. A larger gap gives time to react if the truck brakes or stops suddenly. Passing on a shoulder or tailgating in low visibility is dangerous.

Question 39Class 4 knowledge and rules of the road

A Class 4 driver is operating an ambulance without lights or siren while transporting a stable patient. How should the driver behave in traffic?

  1. Obey all traffic laws as an ordinary vehicle Correct answer.
  2. Treat red lights as yield signs
  3. Use the shoulder to avoid congestion
  4. Exceed the speed limit where safe

Explanation

Emergency exemptions apply only when the vehicle is responding to an emergency with lights and siren operating. During routine transport the ambulance is an ordinary vehicle and must follow all traffic laws. Ignoring signals or speeding without emergency status is unsafe and unlawful.

Question 40Class 4 knowledge and rules of the road

A driver is about to operate a commercial bus with passengers standing in the aisle. What must the driver confirm?

  1. That the trip is shorter than 30 minutes
  2. That the number of passengers does not exceed the vehicle's rated capacity Correct answer.
  3. That the bus has a first-aid kit
  4. That standing passengers hold the handrails

Explanation

A vehicle may not carry more passengers than its rated seating and standing capacity. Overloading reduces stability, lengthens stopping distance, and can exceed insurance and legal limits. Handrails, trip length, and first-aid supplies do not change the capacity rule.

Question 41Class 4 knowledge and rules of the road

A commercial driver is driving a bus down a long grade and the service brakes begin to fade. What is the best immediate response?

  1. Apply the parking brake fully while moving
  2. Turn off the engine to stop the vehicle
  3. Pump the brakes rapidly while staying in high gear
  4. Use a lower gear and engine braking to slow the vehicle Correct answer.

Explanation

Brake fade happens when brakes overheat, so the driver must reduce reliance on them by downshifting and using engine braking. Lower gears limit speed without generating more heat. Turning off the engine or applying the parking brake at speed can cause a loss of control.

Question 42Class 4 knowledge and rules of the road

A school bus driver is completing a trip and a child remains on board after the last stop. What must the driver do?

  1. Call the dispatcher and continue the route
  2. Assume the child will get off at the next stop
  3. Ask another passenger to check the seats
  4. Walk to the back of the bus to check for sleeping or left-behind children Correct answer.

Explanation

Drivers must physically check the bus after every trip to ensure no child is left on board. A walk-through to the rear of the bus is the reliable method and is often paired with a posted check procedure. Relying on assumptions or other passengers can leave a child trapped in a parked bus.

Question 43Class 4 knowledge and rules of the road

A commercial driver is parking a large bus on a city street overnight. Which practice best reduces risk?

  1. Leave the hazard lights on and walk away
  2. Park in a legal space, set the parking brake, and secure the vehicle Correct answer.
  3. Leave the engine running for warmth
  4. Park on a hill without chocking the wheels

Explanation

A parked commercial vehicle must be in a legal location with the parking brake set and the vehicle secured. On a grade, wheels should be turned and chocked as needed to prevent rolling. Leaving the engine running or omitting the brake creates fire, theft, and rollaway hazards.

Question 44Class 4 knowledge and rules of the road

A driver with a Class 4 licence is asked to tow a trailer behind a small bus carrying passengers. What is the key consideration?

  1. Whether the passengers agree to the delay
  2. Whether the licence class and vehicle rating permit towing that trailer Correct answer.
  3. Whether the route avoids highways
  4. Whether the trailer has a spare tire

Explanation

Towing is permitted only if the driver's licence class and the vehicle's rated capacity allow it. Exceeding the rating or the licence authority is unlawful and unsafe. Passenger consent, spare tires, and route choice do not create towing authority.

Question 45Class 4 knowledge and rules of the road

A commercial driver is scheduled for a long shift and has had only three hours of sleep. What does the hours-of-service framework require the driver to prioritize?

  1. A faster route to shorten the trip
  2. Skipping the pre-trip inspection to save time
  3. Adequate off-duty rest before driving Correct answer.
  4. Extra coffee before departure

Explanation

Hours-of-service rules exist to ensure drivers are rested enough to drive safely. A driver who is not fit due to lack of sleep should not begin or continue a shift. Caffeine, route changes, and skipping inspections do not address the underlying fatigue.

Question 46Class 4 knowledge and rules of the road

A bus driver is approaching a steep downhill curve at night with passengers aboard. Which combination of actions is safest?

  1. Maintain speed and rely on the curve warning sign
  2. Brake hard only after entering the curve
  3. Coast in neutral to save fuel
  4. Reduce speed before the curve and use a lower gear through it Correct answer.

Explanation

Speed should be reduced before a curve so the vehicle is stable and controlled through it. A lower gear provides engine braking and keeps the brakes cooler on a descent. Braking hard mid-curve or coasting in neutral reduces control and is unsafe with passengers.

Question 47Class 4 knowledge and rules of the road

A commercial driver's vehicle has a hydraulic brake failure and the pedal sinks to the floor. What is the best immediate response?

  1. Pump the brakes, downshift, and use the parking brake gradually to stop Correct answer.
  2. Open the door and prepare to jump out
  3. Turn the steering wheel sharply to scrub off speed
  4. Shift into neutral and wait for the vehicle to slow

Explanation

With a failed service brake, the driver should pump the pedal to build pressure, downshift for engine braking, and apply the parking brake gradually to avoid locking the wheels. Sharp steering or coasting in neutral removes control. Leaving the vehicle while it is moving is extremely dangerous.

Question 48Class 4 knowledge and rules of the road

A bus driver is merging onto a highway from a ramp and the lane is short. Which approach best manages the risk?

  1. Stop at the end of the ramp and wait for a large gap
  2. Use the shoulder to gain extra distance
  3. Merge slowly and expect highway traffic to change lanes
  4. Build speed on the ramp to match traffic and merge into a confirmed gap Correct answer.

Explanation

Merging safely requires matching the speed of highway traffic and entering a gap that has been confirmed with mirrors and a shoulder check. Stopping at the end of a short ramp leaves the bus in a vulnerable position. Slow merging or shoulder use disrupts traffic and increases collision risk.

Question 49Class 4 knowledge and rules of the road

A driver of a commercial bus is involved in a collision with no injuries, and the vehicles are blocking a lane. What is the correct sequence?

  1. Leave everything in place and wait for police regardless of traffic risk
  2. Drive away without stopping because no one was hurt
  3. Exchange information only if the other driver asks
  4. Move vehicles off the roadway if safe, then exchange information and report as required Correct answer.

Explanation

When there are no injuries and vehicles can be moved, they should be moved off the roadway to reduce further collision risk. Drivers must then exchange required information and report the collision as the law requires. Leaving vehicles blocking a lane or departing the scene is unsafe or unlawful.

Question 50Class 4 knowledge and rules of the road

A school bus driver is stopped with red lights flashing and a vehicle behind ignores the signal and passes. What should the driver do?

  1. Sound the horn continuously and step into the road
  2. Turn off the red lights and let the children cross
  3. Keep the red lights on and keep children on the bus until the passing vehicle has cleared Correct answer.
  4. Chase the passing vehicle to record its plate

Explanation

The driver's first duty is the safety of the children, so they should remain on the bus until the hazard has passed. The red lights stay on to warn other traffic. Chasing a violator or stepping into the roadway puts the driver and children at risk; the incident can be reported later.