Skid Control and Recovery

74 questions

All types74 Multiple choice39 True / False19 Ordering16

You are driving a commercial motor vehicle on a wet asphalt roadway. While navigating a curve, the rear drive wheels lose traction and the back end of the vehicle starts sliding outward to the right. What is the correct procedure to recover from this drive-wheel skid?

Turn the steering wheel sharply to the left away from the skid while maintaining steady accelerator pressure.

Release the accelerator or brake pedal, steer to the right in the direction of the rear skid, and counter-steer as the vehicle begins to straighten.

Engage the engine retarder to maximum power to drag the drive axle and pull the rear wheels back into alignment.

Apply firm, continuous pressure to the service brakes to arrest vehicle momentum before reaching the outer edge of the roadway.

Show answer & explanation

Answer: Release the accelerator or brake pedal, steer to the right in the direction of the rear skid, and counter-steer as the vehicle begins to straighten.

Answer

Release the accelerator or brake pedal, steer to the right in the direction of the rear skid, and counter-steer as the vehicle begins to straighten.

To recover from a drive-wheel skid, the driver must stop accelerating or braking to restore rolling traction to the drive tires. Steering in the direction of the skid (to the right when the rear slides right) realigns the vehicle, and counter-steering immediately as the vehicle straightens prevents a secondary skid in the opposite direction.

Step-by-Step Solution

Stop braking or accelerating immediately by taking your feet off the pedals.

Driveline torque or braking forces locking the tires are removed, allowing the drive wheels to start rolling again.

Rolling tires possess significantly higher directional and lateral traction than locked or spinning tires.

Turn the steering wheel in the direction the rear of the vehicle is skidding (to the right).

The front wheels track in alignment with the sliding rear end, arresting the angular rotation of the vehicle.

Steering in the direction of the skid brings the vehicle back into linear tracking.

Counter-steer back toward the intended travel path as soon as the vehicle starts to straighten.

The vehicle stabilizes in the center of the travel lane without overshooting into a secondary skid.

Failing to counter-steer causes the vehicle to whip around and skid violently in the opposite direction.

Key Concept

Drive-wheel skid recovery and counter-steering technique

Estimated Time:1m 0s

Question 2Question →

If a commercial motor vehicle begins to hydroplane across standing water, the driver should immediately apply firm, steady pressure to the service brake pedal to force the tires back into contact with the road surface.

True

False

Show answer & explanation

Answer: False

Answer

False

The statement is false because standard commercial driving safety procedures dictate that drivers should never brake during hydroplaning. Applying service brakes locks the wheels and prevents the tire treads from channeling water, worsening the skid. The driver should instead ease off the accelerator and allow vehicle momentum to slow until the tires regain contact with the pavement.

Step-by-Step Solution

Analyze the vehicle dynamics during hydroplaning

Hydroplaning occurs when water builds up under the tires faster than the tread can channel it away, causing tires to lose contact with the road and ride on a thin layer of water.

Understanding traction loss is necessary to determine the correct mechanical response.

Evaluate the effect of applying the service brakes while hydroplaning

Braking locks the wheels, preventing them from rotating and pushing through the water film, which instantly leads to a loss of steering control and triggers a severe skid.

Hard or sudden braking during hydroplaning is a primary cause of jackknifing and spinouts.

Identify the standard CDL skid recovery procedure for hydroplaning

The driver must release the accelerator, depress the clutch (if driving a manual transmission), avoid touching the service brakes, and maintain steering alignment until rolling grip is restored.

Allowing the tires to continue rolling enables the tread grooves to clear water and re-establish pavement contact.

Key Concept

Hydroplaning response and skid recovery techniques

Estimated Time:45s

Question 3Question →

When recovering from a drive-wheel skid on a slippery roadway, what must a driver do the moment the vehicle begins to straighten out?

Keep the steering wheel turned firmly in the direction of the initial skid until all motion stops.

Apply hard, continuous service braking to lock the wheels and force the vehicle into a straight slide.

Counter-steer by quickly turning the steering wheel back in the opposite direction.

Engage the engine retarder to help slow the drive axle through engine compression.

Show answer & explanation

Answer: Counter-steer by quickly turning the steering wheel back in the opposite direction.

Answer

Counter-steer by quickly turning the steering wheel back in the opposite direction.

The correct recovery procedure requires counter-steering by turning the wheel quickly back the other way as soon as the vehicle begins to realign. Because a commercial vehicle develops rotational momentum during a skid, failing to counter-steer will cause the vehicle to swing past center and skid out in the opposite direction.

Step-by-Step Solution

Recognize the transition point during drive-wheel skid recovery where the vehicle begins to realign with the roadway.

Vehicle body begins swinging back toward the intended path of travel.

Initial steering into the skid stops the slide, but rotational inertia will carry the vehicle past center.

Counter-steer by turning the steering wheel promptly in the opposite direction.

Front wheels arrest rotational momentum and center the vehicle in the travel lane.

Without rapid counter-steering, the vehicle will over-rotate and skid in the opposite direction (counter-skid).

Key Concept

Counter-steering during drive-wheel skid recovery to prevent secondary skids

Estimated Time:1m 0s

Question 4Question →

While navigating a slick downhill section of roadway, the rear drive axle loses traction and the back of the vehicle begins to swing outward toward the right shoulder. In what sequence must the driver perform the recovery actions to safely regain vehicle stability and directional control?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct procedural order is: (1) release the accelerator and service brakes, (2) countersteer to the right in the direction of the skid, (3) turn the steering wheel back toward the left as the vehicle straightens out, and (4) center the steering wheel to maintain stabilized lane tracking.

According to standard commercial driving recovery protocols, the first mandatory step in a drive-wheel skid is to remove all throttle and brake application so the drive tires can roll and regain lateral grip. Next, the driver must countersteer by turning into the direction of the skid. Crucially, as soon as the vehicle starts to straighten, the driver must immediately turn the steering wheel back the other way to prevent a secondary skid. Finally, the steering is centered to resume safe forward travel.

Step-by-Step Solution

Remove foot from the accelerator or brake pedal

Drive wheels stop spinning or sliding and regain rolling traction with the road surface

Locked or spinning tires have zero lateral grip; allowing them to roll restores directional traction

Steer into the direction of the skid (to the right)

Front wheels align with the vehicle's actual movement path, counteracting the rear slide

Countersteering points the front tires in the direction the vehicle is sliding, stopping the yaw rotation

Countersteer in the opposite direction (to the left) the moment the vehicle straightens

The vehicle does not overshoot its center line or snap into a secondary skid

Failing to turn the wheel back before complete alignment causes severe fishtailing or a secondary skid

Center the steering wheel and resume smooth, controlled travel

The commercial vehicle stabilizes securely within its travel lane

Once dynamic stability is regained, centering the steering maintains normal lane position

Key Concept

Drive-Wheel Skid Recovery Sequence

Estimated Time:1m 15s

Question 5Question →

A commercial motor vehicle driver transitions onto a frost-covered bridge deck and notices that the drive wheels have suddenly lost traction and begun sliding due to engine retarder braking. Which action should the driver take immediately to recover from this skid?

Apply firm, steady service brake pressure to lock all wheels and force the vehicle to slide in a straight line.

Turn off the engine retarder immediately and steer in the direction the rear of the vehicle is skidding.

Steer sharply away from the direction of the skid while maintaining retarder engagement.

Increase the retarder setting to maximum to stop wheel rotation before the vehicle exits the bridge deck.

Show answer & explanation

Answer: Turn off the engine retarder immediately and steer in the direction the rear of the vehicle is skidding.

Answer

Turn off the engine retarder immediately and steer in the direction the rear of the vehicle is skidding.

When an auxiliary retarder causes a drive-wheel skid on a low-traction surface such as bridge frost, the driver must instantly switch off the retarder to remove braking torque from the drive axle. This allows the wheels to turn freely, restoring rolling traction so the driver can steer in the direction the rear of the vehicle is skidding to regain directional control.

Step-by-Step Solution

Identify the cause of traction loss as drive-wheel braking drag from the retarder on a slippery surface.

Recognizes that the drive wheels are skidding because auxiliary braking force exceeds available tire-road friction.

Retarders apply continuous braking force to drive axles, which easily breaks tire adhesion on wet, icy, or frosted roads.

Disengage the retarder immediately without applying service brakes.

Removes the braking torque from the drive wheels so they can spin up to road speed.

Drive wheels must be rolling freely to generate the lateral traction necessary for directional control.

Counter-steer smoothly in the direction the rear of the vehicle is sliding, then center the wheel as the vehicle straightens.

Brings the front and rear of the vehicle back into alignment without triggering a secondary skid.

Steering in the direction of the rear skid aligns the steer tires with the sliding path to catch and arrest the swing.

Key Concept

Drive-wheel skid recovery and retarder disengagement on low-traction surfaces

Estimated Time:1m 0s

Question 6Question →

While hauling a loaded trailer across a packed-snow highway, a driver begins to negotiate a gradual right-hand bend. The tractor's drive wheels suddenly lose traction, causing the rear end of the tractor to swing out toward the left side of the lane. Which sequence of actions should the driver immediately take to recover from this skid?

Steer sharply toward the right away from the slide and maintain engine acceleration to pull the combination unit straight.

Release the accelerator, quickly steer toward the left in the direction of the slide, and counter-steer as the vehicle straightens.

Activate the engine retarder to its highest setting to slow the drive axle independently of the steer tires.

Apply hard, steady service brake pressure throughout the curve to lock the sliding wheels and regain directional heading.

Show answer & explanation

Answer: Release the accelerator, quickly steer toward the left in the direction of the slide, and counter-steer as the vehicle straightens.

Answer

Release the accelerator, quickly steer toward the left in the direction of the slide, and counter-steer as the vehicle straightens.

To recover from a drive-wheel skid where the rear end slides to the left, the driver must immediately release the throttle so the wheels can regain rolling traction, steer quickly in the direction of the skid (to the left), and counter-steer as the vehicle begins to straighten out to avoid a secondary skid.

Step-by-Step Solution

Remove foot from the accelerator pedal immediately.

Drive wheels stop spinning and can begin rolling freely to regain lateral grip.

Cutting power stops wheel spin caused by over-acceleration or reduced friction.

Turn the steering wheel quickly in the direction of the skid (to the left, toward the direction the rear is sliding).

The front wheels track with the sliding rear end, preventing the tractor from spinning out.

Aligning the steer tires with the vehicle's direction of movement restores directional control.

Counter-steer back in the intended direction of travel as soon as the vehicle starts to straighten.

The vehicle stabilizes in its lane rather than whipping into a secondary skid in the opposite direction.

Failing to straighten the wheels in time causes the vehicle to overshoot and snap into an uncontrollable reverse skid.

Key Concept

Drive-wheel skid recovery requires removing driving torque, steering into the skid direction, and counter-steering upon alignment.

Estimated Time:1m 0s

Question 7Question →

During a turn at a rain-slicked intersection, the front wheels of a vehicle lose grip and the front end continues traveling in a straight path despite the steering wheel being turned. What action should be taken to allow the front tires to regain steering traction?

Turn the steering wheel more sharply into the corner to force tire bite

Ease off the accelerator pedal and allow the vehicle to slow down without harsh braking

Activate the auxiliary engine retarder to quickly decelerate the drive axle

Apply firm service brakes immediately while holding the steering wheel at full lock

Show answer & explanation

Answer: Ease off the accelerator pedal and allow the vehicle to slow down without harsh braking

Answer

Ease off the accelerator pedal and allow the vehicle to slow down without harsh braking

In a front-wheel skid, the vehicle continues straight because the front tires have exceeded their maximum available lateral traction. The standard CDL recovery procedure requires letting the vehicle slow down by releasing the accelerator pedal and avoiding sudden, hard braking, which allows rolling traction to return to the steer axle.

Step-by-Step Solution

Recognize the front-wheel skid condition

Identify that the vehicle is understeering and failing to respond to steering angle inputs due to lost front-tire traction.

Front-wheel skids occur when front tires slide along the road surface rather than rolling in the intended turning direction.

Release the accelerator smoothly and avoid aggressive brake applications

The forward momentum decreases naturally without locking any wheels.

Slowing the vehicle reduces centrifugal forces and permits the front tires to regain their grip on the pavement.

Ease the steering wheel back toward straight-ahead until traction returns

Tire friction transitions from dynamic sliding back to static/rolling grip, restoring directional control.

Excessive steering angles maintain tire saturation and extend the slide.

Key Concept

Front-wheel skid (understeer) recognition and recovery procedures

Estimated Time:1m 0s

Question 8Question →

A commercial motor vehicle driver encounters sudden icy road conditions and the rear drive wheels begin sliding sideways. What is the correct sequence of actions the driver must take to safely recover control? Arrange the following recovery steps in chronological order from first to last.

Drag items to arrange them in the correct order

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Answer

The correct sequence is: (1) release the accelerator pedal, (2) depress the clutch pedal, (3) steer into the direction of the skid, and (4) counter-steer in the opposite direction as alignment begins.

Recovering from a drive-wheel skid follows a precise four-stage protocol: first, release the accelerator to stop drive wheel spin; second, depress the clutch to remove driveline drag; third, steer in the direction of the skid to realign the tractor; and fourth, counter-steer in the opposite direction the moment the vehicle begins to straighten to neutralize rotational momentum and prevent a secondary skid.

Step-by-Step Solution

Remove power from the drive axle

Drive wheels stop spinning under engine power, facilitating the return of static rolling friction.

Applying throttle or maintaining drive torque perpetuates wheel slip and prevents tires from regaining traction.

Disengage the transmission with the clutch

The drivetrain is decoupled, preventing engine compression braking from locking the drive wheels.

Engine drag can act like a brake on slick surfaces, keeping the drive wheels from freely turning.

Steer into the skid direction

Front steering wheels align with the vehicle's momentum to regain directional path control.

Turning toward the direction the rear is sliding allows the front axle to track with the skid and stop the rotation.

Counter-steer as the vehicle straightens

The vehicle stabilizes along its original path without swinging out in the other direction.

Failing to counter-steer promptly results in an overcorrection secondary skid that often causes a jackknife or rollover.

Key Concept

Drive-wheel skid recovery requires immediate throttle release, clutch disengagement, steering into the skid, and counter-steering to prevent secondary skidding.

Estimated Time:1m 0s

Question 9Question →

Applying the trailer hand brake during a trailer skid stabilizes the vehicle by pulling the combination unit into alignment.

True

False

Show answer & explanation

Answer: False

Answer

False

The statement is false because applying the trailer hand brake is the worst action to take during a trailer skid. It locks the trailer wheels further, preventing them from regaining the rolling traction necessary to follow the tractor. The correct procedure is to release the brakes immediately.

Step-by-Step Solution

Identify the underlying mechanical cause of a trailer skid

Trailer skids typically begin when the trailer wheels lose traction or lock up due to over-braking or slippery road surfaces.

Understanding why the trailer is sliding dictates the appropriate physical correction.

Evaluate the effect of applying the trailer hand brake (trolley valve)

Applying the hand brake sends air pressure exclusively to the trailer brakes, locking sliding tires and preventing wheel rotation.

Tires that are locked cannot generate the lateral cornering force needed to maintain directional control.

Determine the proper CDL emergency recovery procedure

The driver must release all brakes so the trailer wheels can roll freely, regain grip, and follow the tractor.

Re-establishing rolling traction is the only way to arrest the sideways slide and prevent a jackknife.

Key Concept

Trailer skid recovery and avoiding trailer hand brake usage

Estimated Time:1m 0s

Question 10Question →

After pulling onto an expressway interchange with damp pavement and loose gravel, excessive acceleration causes the tractor's drive tires to spin and the rear chassis begins drifting sideways. Which response is the correct method to arrest the skid and re-establish directional control?

Turn the steering wheel in the opposite direction of the rear slide while maintaining steady engine power.

Depress the service brake pedal firmly while still negotiating the curve to force the vehicle to slow down.

Release the throttle completely to allow the drive wheels to regain grip, and turn the steering wheel in the direction of the rear-wheel slide.

Switch on the electromagnetic or exhaust retarder to rapidly decelerate the drive axle wheels.

Show answer & explanation

Answer: Release the throttle completely to allow the drive wheels to regain grip, and turn the steering wheel in the direction of the rear-wheel slide.

Answer

Release the throttle completely to allow the drive wheels to regain grip, and turn the steering wheel in the direction of the rear-wheel slide.

To recover from a drive-wheel acceleration skid, the driver must immediately release the accelerator so the drive wheels can regain rolling traction. Simultaneously, the driver must steer in the direction the rear of the vehicle is sliding, followed by smooth counter-steering as the vehicle straightens to prevent a secondary skid in the opposite direction.

Step-by-Step Solution

Identify the cause of the skid as drive-wheel over-acceleration on a low-friction surface and immediately remove foot pressure from the throttle.

Drive wheels stop spinning freely and begin to re-establish rolling friction with the roadway.

An acceleration skid happens when drive wheels lose traction from excessive power; cutting power allows tire treads to grip again.

Turn the steering wheel in the same direction the rear of the vehicle is sliding, followed by prompt counter-steering as alignment is regained.

The front steer tires align with the path of the sliding rear chassis, preventing a spin-out or jackknife.

Steering in the direction of the skid counteracts rotational forces and guides the combination back into straight-line tracking.

Key Concept

Drive-wheel skid recovery and acceleration skid control on slippery surfaces

Estimated Time:1m 0s

Question 11Question →

When an unladen semi-trailer begins swinging laterally during braking on a slick roadway, applying the trailer hand brake (trolley valve) will stabilize the combination unit by stretching the vehicle combination taut.

True

False

Show answer & explanation

Answer: False

Answer

False

The statement is false because commercial driving safety standards strictly prohibit using the trailer hand valve to straighten a sliding trailer. A trailer skid occurs when the trailer tires break traction and lock up. Applying the trailer hand brake exacerbates the wheel lockup, depriving the tires of the rolling motion required to generate lateral cornering grip and rapidly worsening a trailer jackknife. The proper response is to release all braking pressure immediately so the trailer tires can spin, regain adhesion, and trail straight behind the tractor.

Step-by-Step Solution

Analyze the mechanics of a trailer skid and tire traction.

A trailer skids and swings laterally when its wheels lock up or lose directional grip due to excessive braking or lack of weight on the trailer axles.

Locked or sliding tires have zero lateral cornering traction and are free to slide sideways due to road crown or centrifugal forces.

Evaluate the effect of applying the trailer hand brake (trolley valve) during an active trailer skid.

Engaging the trailer hand brake applies continuous friction to the trailer brake drums/rotors, locking the trailer wheels further.

The only way to recover from a trailer skid is to release all brakes so the trailer wheels can roll freely, restore traction, and naturally align behind the towing tractor.

Key Concept

Trailer Skid Recovery and Prohibition of Trailer Hand Brake Use

Estimated Time:1m 0s

Question 12Question →

When experiencing a front-wheel skid on a slippery roadway, turning the steering wheel more sharply in the intended direction of travel helps the front tires regain traction.

True

False

Show answer & explanation

Answer: False

Answer

False

The statement is false because front-wheel skids occur when the front steering tires lose traction, causing the vehicle to continue in a straight line regardless of steering wheel position. Turning the wheel further does not restore traction; the driver must ease off the accelerator and let the vehicle slow down until tire grip returns.

Step-by-Step Solution

Analyze the physical behavior of front tires during a front-wheel skid (understeer).

The front tires have lost adhesion with the road surface and push straight ahead despite steering input.

Understanding that sliding tires lack directional control is critical to selecting the proper corrective response.

Evaluate whether increasing the steering angle can restore lost friction on a slippery surface.

Increasing the steering angle adds no turning force and prevents the skidding tires from regaining rolling friction.

The only proven way to stop a front-wheel skid is to let the vehicle slow down naturally by releasing the throttle.

Key Concept

Front-Wheel Skid Dynamics and Recovery Procedures

Estimated Time:45s

Question 13Question →

You are operating a commercial motor vehicle on a frosty highway when sudden acceleration on an upgrade causes the drive wheels to spin and slide toward the right shoulder. What is the correct sequential order of actions to successfully control and recover from this drive-wheel skid?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The driver must first release the accelerator to stop wheel spin, steer in the direction of the slide (to the right), counter-steer as the vehicle aligns to prevent a secondary skid, and finally reintroduce gentle throttle once stability is fully restored.

To recover from a drive-wheel acceleration skid, removing drive torque by releasing the accelerator is the vital first step so the tires regain rolling grip. The driver must then quickly steer in the direction of the rear slide, immediately counter-steer as the vehicle aligns to prevent snapping into a secondary skid, and only reapply gentle throttle once the vehicle is completely stable.

Step-by-Step Solution

Release the accelerator pedal immediately.

The drive wheels stop spinning and resume rolling contact with the roadway.

Spinning tires lose lateral cornering grip; allowing the wheels to roll freely restores side-to-side friction.

Turn the steering wheel quickly in the direction of the skid (to the right).

The front wheels guide the vehicle in line with the sliding rear axle.

Directing the front wheels into the skid path arrests vehicle yaw and stops the jackknife or spinout angle from widening.

Counter-steer back to the left as the vehicle begins to straighten.

The vehicle stabilizes on its intended travel path without whipping across center.

Failing to counter-steer immediately as the vehicle straightens causes momentum to swing the rear in the opposite direction.

Reintroduce smooth, gradual throttle once the vehicle is aligned and stabilized.

Safe forward travel continues without triggering another traction loss.

Throttle application must wait until the tires have full rolling grip and the vehicle is completely straight.

Key Concept

Drive-wheel acceleration skid recovery procedure: throttle release, steering into the skid, proactive counter-steering, and smooth re-engagement.

Estimated Time:1m 0s

Question 14Question →

When heavy braking on wet asphalt locks the drive wheels and causes the rear of the vehicle to slide laterally, what is the most critical initial step to regain vehicle control?

Activate the auxiliary engine retarder to assist in rapidly decelerating the drive axle.

Stop braking immediately to allow the locked wheels to roll and restore traction.

Steer firmly in the opposite direction of the rear slide while keeping the brakes pressed.

Maintain heavy braking throughout the slide to bleed off vehicle momentum before steering.

Show answer & explanation

Answer: Stop braking immediately to allow the locked wheels to roll and restore traction.

Answer

Stop braking immediately to allow the locked wheels to roll and restore traction.

In any drive-wheel braking skid, the first and most critical action is to stop braking. Letting up on the brake pedal allows the locked drive wheels to roll again, which restores the friction and lateral grip needed to steer and stabilize the vehicle.

Step-by-Step Solution

Release the service brake pedal immediately upon recognizing the drive-wheel skid.

The drive wheels unlock and resume rolling across the pavement.

Locked wheels slide without directional grip; rolling wheels are necessary to restore traction and directional control.

Steer in the direction the rear of the vehicle is sliding, then counter-steer quickly as the vehicle straightens.

The vehicle realigns with the intended lane of travel without snapping into a secondary skid.

Turning into the skid aligns the front and rear axles, while prompt counter-steering prevents overshooting into a skid in the opposite direction.

Key Concept

Drive-Wheel Skid Recovery and Traction Restoration

Estimated Time:1m 0s

Question 15Question →

During recovery from a drive-wheel skid, counter-steering back in the opposite direction as the vehicle aligns with the intended path of travel is required to prevent a secondary skid in the opposite direction.

True

False

Show answer & explanation

Answer: True

Answer

True

The statement is true because commercial vehicles possess substantial rotational inertia during a drive-wheel skid. As the vehicle comes back on course, the driver must immediately counter-steer in the opposite direction to prevent the rear end from swinging past center and causing a secondary skid.

Step-by-Step Solution

Analyze the mechanics of initial drive-wheel skid recovery.

Steering in the direction of the rear-wheel slide aligns the front wheels with the vehicle's momentum to regain directional control.

Turning into the skid counters the initial yaw rotation of the vehicle.

Evaluate rotational momentum as the vehicle straightens on course.

The straightening vehicle has kinetic momentum that tends to continue rotating past the desired travel path.

Without rapid counter-steering back the other way, the vehicle overcorrects and enters an immediate secondary skid in the opposite direction.

Key Concept

Drive-Wheel Skid Recovery and Counter-Steering Dynamics

Estimated Time:1m 0s

Question 16Question →

A loaded semi-truck navigating a wet interstate curve experiences a sudden drive-wheel skid as the rear of the tractor swings out toward the right shoulder. What is the correct initial procedure to regain directional control?

Steer sharply to the left away from the sliding direction while maintaining engine power.

Switch on the engine brake retarder to maximum setting to slow the drive axle.

Release the accelerator, depress the clutch pedal, and steer right toward the direction the rear wheels are sliding.

Apply firm and continuous service brakes to force the vehicle to an abrupt halt.

Show answer & explanation

Answer: Release the accelerator, depress the clutch pedal, and steer right toward the direction the rear wheels are sliding.

Answer

The driver must release the accelerator, depress the clutch, and steer toward the right in the direction of the skid.

Releasing the accelerator removes driving torque from slipping drive wheels, and depressing the clutch allows the wheels to roll freely. Steering into the skid (to the right when the rear slides right) realigns the front and rear wheels, enabling the tires to regain traction and arrest the slide.

Step-by-Step Solution

Remove foot from accelerator and depress the clutch pedal.

Disengages driveline torque and mechanical braking from drive wheels.

The drive wheels must be allowed to roll freely so they can regain traction with the road surface.

Steer toward the right in the direction the rear of the vehicle is sliding.

Realigns the tractor's front wheels with the path of the sliding rear axle.

Turning in the direction of the skid arrests lateral momentum and prevents the vehicle from spinning out.

Counter-steer back smoothly as the vehicle comes back in line.

Stabilizes the vehicle along its intended trajectory.

Failing to counter-steer once traction is regained causes a secondary skid in the opposite direction.

Key Concept

Drive-wheel skid recovery and directional steering control

Estimated Time:1m 0s

Question 17Question →

While driving on a slippery road surface, the rear wheels of your commercial motor vehicle lose traction and the back end begins to slide to the right. Which of the following actions should you take to recover from this drive-wheel skid?

Steer sharply to the left, away from the direction the rear wheels are sliding.

Steer toward the right in the direction of the skid, then counter-steer as the vehicle straightens.

Activate the engine retarder immediately while keeping the steering wheel held firmly straight.

Apply firm, continuous service brake pressure while attempting to negotiate the roadway curve.

Show answer & explanation

Answer: Steer toward the right in the direction of the skid, then counter-steer as the vehicle straightens.

Answer

Steer toward the right in the direction of the skid, then counter-steer as the vehicle straightens.

When recovering from a drive-wheel skid, the driver must turn the front wheels in the direction the rear of the vehicle is sliding to allow the drive tires to regain rolling traction, followed immediately by counter-steering to prevent swinging into a secondary skid in the opposite direction.

Step-by-Step Solution

Release the accelerator pedal and avoid hard braking.

Removes excess drive torque and prevents drive-wheel lockup.

Tires require rolling motion to regain directional grip and lateral stability.

Turn the steering wheel in the direction the rear of the vehicle is sliding (to the right).

Aligns the front wheels with the vehicle's momentum and rear-axle trajectory.

Re-establishes vehicle alignment along the intended path of travel.

Counter-steer in the opposite direction as soon as the vehicle begins to straighten out.

Prevents the vehicle from swinging past center into an opposite skid.

Maintains control and stabilizes the commercial vehicle on its path.

Key Concept

Drive-wheel skid recovery through directional steering and counter-steering

Estimated Time:45s

Question 18Question →

When the front wheels of a commercial motor vehicle lock up during a braking skid, the vehicle will continue to slide straight ahead regardless of how the steering wheel is turned.

True

False

Show answer & explanation

Answer: True

Answer

True. When front wheels lock up, steering capability is completely lost and the vehicle slides in a straight line.

The statement is true because locked front wheels lose all directional grip with the pavement. Without rotating wheels to generate lateral force, the commercial vehicle's momentum carries it straight ahead regardless of steering wheel adjustments.

Step-by-Step Solution

Analyze tire behavior during a front-wheel lockup condition.

The front tires stop rolling and begin sliding across the road surface.

Excessive braking force overcomes tire-road traction, preventing rotation.

Evaluate the vehicle's steering response when tires are sliding.

Turning the steering wheel produces no change in vehicle direction.

Tires must be rolling to generate lateral cornering forces needed to steer.

Key Concept

Front-Wheel Skid Dynamics and Loss of Steering Control

Estimated Time:45s

Question 19Question →

A commercial motor vehicle driver negotiating a wet, curved interchange ramp notices the drive wheels losing traction and the rear of the tractor sliding outward. The driver correctly releases the accelerator and turns the steering wheel in the direction of the skid. As the vehicle begins to align and straighten out, what secondary action must the driver take to prevent skidding in the opposite direction?

Engage the engine retarder to maximum resistance to slow the spinning drive wheels down quickly.

Hold the steering wheel firmly in the direction of the initial slide until the combination comes to a complete halt.

Counter-steer by turning the steering wheel in the opposite direction as soon as the vehicle starts to straighten.

Apply firm, continuous service brake pedal pressure while steering toward the inside shoulder of the curve.

Show answer & explanation

Answer: Counter-steer by turning the steering wheel in the opposite direction as soon as the vehicle starts to straighten.

Answer

Counter-steer by turning the steering wheel in the opposite direction as soon as the vehicle starts to straighten.

During drive-wheel skid recovery, turning into the skid redirects the front of the vehicle along the slide path. However, as the vehicle starts to straighten out, the driver must immediately counter-steer in the opposite direction. Without this timely counter-steering, the vehicle's rear end will overshoot and skid violently in the opposite direction.

Step-by-Step Solution

Analyze the vehicle's dynamic state during the recovery sequence.

The initial turn into the skid has started to bring the vehicle back into alignment, but rotational momentum is carrying the rear axle past center.

When recovering from a drive-wheel skid, turning into the slide redirects the vehicle, but the inertia of the rear will cause an overshooting effect if steering input is maintained.

Identify the mandatory secondary steering input per commercial driving safety standards.

Execute a counter-steering maneuver by turning the wheel back toward the opposite direction.

Counter-steering stabilizes the chassis and prevents the vehicle from whipping around into a secondary skid or jackknife in the other direction.

Evaluate and reject improper auxiliary braking inputs.

Maintain rolling wheel traction without service braking or engine retarder activation.

Braking or engaging retarders on wet surfaces robs tires of cornering and rolling friction, causing total loss of directional control.

Key Concept

Drive-wheel skid recovery and secondary counter-steering technique

Estimated Time:1m 30s

Question 20Question →

When accelerating on a snow-covered roadway, you notice the drive wheels spinning and the rear of the vehicle beginning to slide. What is the immediate first step to regain traction and recover from this acceleration skid?

Engage the engine retarder to slow the drive axle down automatically.

Release the accelerator pedal to allow the drive wheels to regain traction.

Steer abruptly in the opposite direction of the slide while maintaining throttle pressure.

Brake aggressively while downshifting through the turn.

Show answer & explanation

Answer: Release the accelerator pedal to allow the drive wheels to regain traction.

Answer

Release the accelerator pedal to allow the drive wheels to regain traction.

In an acceleration skid, excess power causes the drive wheels to spin and lose traction with the road. The only effective initial response is to immediately take your foot off the accelerator pedal, allowing the drive wheels to stop spinning and re-establish rolling grip.

Step-by-Step Solution

Identify the cause of the skid as an acceleration skid caused by excessive throttle on a slippery surface.

Recognized that the drive wheels are spinning and slipping due to engine power exceeding tire traction.

Correct recovery requires eliminating the force that initiated the loss of traction.

Immediately remove foot from the accelerator pedal without applying hard service braking.

Drive wheels stop spinning faster than road speed and regain rolling friction with the surface.

Removing drive torque allows tire tread to reconnect with the road surface and restores directional control.

Key Concept

Drive-Wheel Acceleration Skid Recovery

Estimated Time:45s

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