Examkin

Space for Turns

36 soru

Tüm türler36Çoktan seçmeli19Doğru / Yanlış10Sıralama7
Soru 1Soru →

When driving a large commercial vehicle that needs extra space to make a right turn at an intersection, which of the following is the correct steering technique?

Cevabı ve açıklamayı göster

Cevap: Keep the rear of the vehicle close to the right curb on approach and swing wide into the new street as you complete the turn.

Cevap

Keep the rear of the vehicle close to the right curb on approach and swing wide into the new street as you complete the turn.
The correct method for making a right turn in a long commercial vehicle is the button-hook turn: stay close to the right curb during the approach to prevent other drivers from passing on the right, and then swing wide into the cross street only as you complete the turn.

Adım Adım Çözüm

1
Evaluate the risk of trailing traffic attempting to pass on the right side during a right turn.
Identify that leaving an open gap on the right invites smaller vehicles into the vehicle's blind spot.
Large commercial vehicles experience off-tracking, where rear wheels follow a shorter radius than front wheels.
2
Select the proper 'button-hook' turning maneuver.
Approach close to the right curb to block traffic, then turn wide into the destination street.
This prevents right-side squeeze collisions while providing sufficient clearance for trailer off-tracking.

Anahtar Kavram

Proper Right-Turn Execution and Off-Tracking Management (Button-Hook Turn)
Tahmini Süre:45s
Soru 2Soru →

When a commercial vehicle with significant rear overhang past its rear axle executes a sharp turn, the spatial clearance hazard is confined entirely to the inside of the turning radius due to off-tracking pulling the rear tires inward. Is this statement true or false?

Cevabı ve açıklamayı göster

Cevap: False

Cevap

False (Commercial vehicles with rear overhang generate hazards on both the inside from off-tracking and the outside from tail swing).
The statement is false because commercial vehicle turns involve two opposing geometric movements: off-tracking, which pulls the rear wheels toward the inside of the turn, and tail swing, which causes the rear overhang past the axle to sweep outward into the adjacent lane or sidewalk on the outside of the turn.

Adım Adım Çözüm

1
Analyze the spatial path followed by the rear axle tires during a turn.
The rear tires follow a shorter, tighter path than the front steer tires, pulling inward toward the curb due to off-tracking.
Fixed non-steering rear axles track toward the center of rotation during any turning maneuver.
2
Analyze the spatial trajectory of the vehicle body extending behind the rear axle.
The rear overhang pivots around the rear axle fulcrum and swings outward in the direction opposite the turn.
Geometric lever action forces the structure behind the pivot point to sweep outward into adjacent lanes or over the sidewalk.
3
Synthesize the total clearance envelope required to execute the turn safely.
The driver must actively manage clearance on both the inside perimeter (for off-tracking) and the outside perimeter (for tail swing).
Focusing solely on inside tire tracking leaves the outer perimeter vulnerable to striking surrounding vehicles, poles, or pedestrians.

Anahtar Kavram

Interaction between inward rear-axle off-tracking and outward tail swing during commercial vehicle turning maneuvers.
Tahmini Süre:1m 30s
Soru 3Soru →

When making a left turn in a commercial vehicle, the driver should reach the center of the intersection before beginning the turn to prevent the rear wheels from off-tracking into oncoming traffic lanes.

Cevabı ve açıklamayı göster

Cevap: True

Cevap

True
Commercial driving standards require pulling out to the center of the intersection before beginning a left turn. Because trailing axles off-track inward, entering the center point first ensures the rear of the vehicle remains clear of vehicles stopped in opposing lanes.

Adım Adım Çözüm

1
Analyze the spatial dynamics and wheel path geometry of a commercial vehicle during a left turn.
Because of off-tracking, the rear wheels follow a shorter path than the front steer wheels, cutting inward toward the inside of the turn.
Understanding off-tracking is required to determine proper lane positioning during intersection maneuvers.
2
Evaluate the effect of initiating the turn at the center of the intersection versus turning early.
Reaching the center before turning keeps the off-tracking path within the designated intersection clearing area rather than encroaching on oncoming lanes.
Beginning the turn too early pulls the left side and rear of the vehicle across opposing lanes where other vehicles may be waiting.

Anahtar Kavram

Intersection center positioning to control off-tracking during left turns
Tahmini Süre:45s
Soru 4Soru →

You are driving a 53-foot tractor-trailer and preparing to make a right turn onto a narrow cross street. To prevent collisions caused by off-tracking and stop other vehicles from attempting to pass on your right, which procedure should you follow?

Cevabı ve açıklamayı göster

Cevap: Keep the rear of your vehicle close to the right curb as you approach, then swing wide into the oncoming lane of the cross street only as you complete the turn.

Cevap

Keep the rear of the vehicle close to the right curb upon approaching the intersection, then swing wide into the cross street only as the turn is completed (button-hook turn).
The correct method is the button-hook turn: keeping the rear of the vehicle close to the right curb during the approach prevents other vehicles from squeezing by on the right. If extra space is required due to off-tracking, the driver swings wide into the intersecting street only as the turn is completed, while monitoring mirrors and waiting for oncoming traffic to clear.

Adım Adım Çözüm

1
Analyze the spatial risks associated with large commercial vehicle right turns.
Long combination vehicles experience significant rear-wheel off-tracking (rear wheels follow a shorter path than steer wheels), and trailing traffic often attempts to pass on the right if a gap appears.
Proper turn setup must address both trailer off-tracking clearance and blocking following vehicles from entering the right-side blind spot.
2
Evaluate the correct steering path (button-hook vs. jug-handle).
A button-hook turn keeps the rear close to the curb approaching the turn and swings wide into the target street only as necessary during completion, whereas a jug-handle swings wide before the turn.
Swinging wide before entering the turn creates a dangerous space on the right side that other motorists will misinterpret as an open lane or left turn.

Anahtar Kavram

Button-hook right turn execution and off-tracking management
Tahmini Süre:1m 0s
Soru 5Soru →

You are operating a 53-foot combination vehicle approaching a large intersection with two designated left-turn lanes. Shortly after completing your left turn, you must execute a right turn onto a narrow two-lane street. To safely manage your vehicle's off-tracking and prevent blind-spot collisions, which of the following sequences describes the correct lane selection and turning maneuvers?

Cevabı ve açıklamayı göster

Cevap: Enter the rightmost left-turn lane, reach the center of the intersection before initiating the left turn, and later execute a button-hook right turn by keeping the rear wheels close to the right curb.

Cevap

The correct sequence involves utilizing the rightmost left-turn lane, reaching the intersection's center before turning, and performing a button-hook right turn.
This sequence correctly applies all three critical CDL rules for space management during turns. Using the rightmost left-turn lane ensures adjacent vehicles are on your left where visibility is unobstructed, reaching the intersection center prevents off-tracking into oncoming traffic, and the button-hook right turn safely blocks the right side from passing vehicles without swinging prematurely into opposing lanes.

Adım Adım Çözüm

1
Evaluate the dual left-turn lanes and make a selection.
Select the rightmost left-turn lane.
When there are two left-turn lanes, the rightmost lane must be chosen so that other turning vehicles are on the left (driver's side), where visibility is superior. This prevents off-tracking into a vehicle hidden in the right-side blind spot.
2
Determine the proper turning apex for the left turn.
Proceed straight until reaching the center of the intersection before turning the steering wheel.
Turning too soon causes the trailer to cut the corner (off-track) directly into the path of oncoming traffic waiting at the intersection.
3
Execute the subsequent right turn onto the narrow street.
Perform a button-hook turn by keeping the trailer close to the curb and swinging the tractor slightly wide into the destination lane.
A button-hook turn prevents a gap from forming on the right side, blocking smaller vehicles from attempting to pass. A jug-handle turn (swinging left before turning right) creates a dangerous gap and is incorrect.

Anahtar Kavram

Off-tracking Management and Intersection Setup
Tahmini Süre:1m 30s
Soru 6Soru →

You are operating a 53-foot tractor-trailer approaching a tight right turn onto a narrow two-lane cross street. To properly compensate for trailer off-tracking while preventing other motorists from attempting to pass on your blind side, which procedure should you follow?

Cevabı ve açıklamayı göster

Cevap: Keep the vehicle close to the right curb on approach, drive straight into the intersection, and swing wide into the cross street as you complete the turn.

Cevap

Keep the vehicle close to the right curb on approach, drive straight into the intersection, and swing wide into the cross street as you complete the turn.
The correct method is to execute a button-hook turn. By keeping the rear of the vehicle close to the curb upon approach, you block motorists from attempting to pass on your right side. Pulling straight forward into the intersection and swinging wide into the receiving street as you complete the turn provides the necessary clearance for trailer off-tracking.

Adım Adım Çözüm

1
Analyze the turning mechanics and risk factors of long combination vehicles.
Due to off-tracking, the trailer wheels follow a significantly shorter path than the tractor's steer wheels.
Understanding off-tracking geometry is essential to prevent curb clipping and side-swipe collisions.
2
Evaluate approach positioning to control adjacent traffic lanes.
Maintaining a position close to the right curb blocks the right side and eliminates space for other vehicles to pass.
If an opening is left on the right, smaller vehicles may attempt to pass on the blind side and become pinned.
3
Select the correct turning maneuver pattern.
Perform a button-hook turn by advancing into the intersection before turning wide into the cross street, rather than executing an unsafe jug-handle turn.
Swinging wide late in the turn accommodates trailer off-tracking safely without exposing the right side.

Anahtar Kavram

Button-Hook Turning vs. Jug-Handle Turning and Off-Tracking Prevention
Tahmini Süre:1m 30s
Soru 7Soru →

When navigating an intersection featuring two designated left-turn lanes, a commercial driver should choose the outside (right-hand) turn lane.

Cevabı ve açıklamayı göster

Cevap: True

Cevap

True
Commercial vehicle drivers should always use the outside (right-hand) left-turn lane when two turning lanes are available. This position gives the driver better mirror visibility along the left side and allows adequate room for the trailer's off-tracking without crossing into other lanes.

Adım Adım Çözüm

1
Analyze how vehicle geometry affects turns at multi-lane intersections.
Due to off-tracking, the rear trailer wheels follow a tighter turning radius than the tractor's front steering wheels.
Understanding off-tracking is essential for selecting the safest lane position.
2
Apply standard CDL lane-selection rules for dual left-turn lanes.
The driver must select the outside (right-hand) turn lane to safely accommodate the trailer path without encroaching on surrounding traffic.
Choosing the outside turn lane prevents the vehicle from swinging wide across adjacent lanes and maximizes mirror visibility during the maneuver.

Anahtar Kavram

Dual left-turn lane selection and off-tracking management
Tahmini Süre:45s
Soru 8Soru →

When maneuvering a combination commercial vehicle through an intersection featuring dual left-turn lanes, the driver should initiate the turn from the inside (leftmost) turn lane to ensure the vehicle takes the shortest possible path through the intersection.

Cevabı ve açıklamayı göster

Cevap: False

Cevap

False. When multiple left-turn lanes are available, a commercial driver must always choose the outside (right-hand) turn lane to safely accommodate trailer off-tracking.
The statement is false because commercial driving safety regulations mandate selecting the outside (right-hand) turn lane whenever dual left-turn lanes exist. Off-tracking causes the rear trailer wheels to track inward toward the center of the turn arc; initiating from the inside lane forces the tractor to swing outward into the adjacent lane to prevent the trailer from hitting the curb, thereby creating a severe sideswipe hazard.

Adım Adım Çözüm

1
Analyze the vehicle dynamics during intersection turns.
Identified that combination vehicles exhibit significant off-tracking, where the trailer's rear axles track noticeably to the inside of the path taken by the front steering axle.
Off-tracking geometry determines the required turning envelope and lane clearance.
2
Evaluate the risk profile of initiating a turn from the inside (leftmost) lane in a dual-turn setup.
Determined that an inside-lane turn restricts driver visibility on the right side and forces the tractor to swing out to the right to clear the turn, directly encroaching upon the adjacent active turning lane.
Swinging wide into an occupied neighboring lane creates an immediate sideswipe hazard.
3
Apply standard CDL multi-lane turn positioning rules.
Confirmed that the outside (right-hand) left-turn lane is the required lane choice because it provides adequate room for off-tracking and keeps the driver's left mirror view unobstructed.
Starting on the outside lane prevents encroaching on other traffic and avoids cutting off adjacent vehicles.

Anahtar Kavram

Dual left-turn lane selection and off-tracking space management
Tahmini Süre:1m 30s
Soru 9Soru →

When preparing to make a left turn in a commercial motor vehicle at an intersection with two-way traffic, why must the driver reach the center of the intersection before beginning the turn?

Cevabı ve açıklamayı göster

Cevap: To prevent the rear wheels of the vehicle from cutting across oncoming traffic lanes due to off-tracking

Cevap

Reaching the center of the intersection before turning prevents the vehicle's rear wheels from cutting across oncoming traffic lanes due to off-tracking.
Commercial vehicles experience significant off-tracking, meaning the rear wheels follow a shorter path than the front wheels. By driving to the center of the intersection before steering left, the driver ensures that the inward track of the rear wheels stays entirely within designated lanes rather than cutting across oncoming traffic lanes.

Adım Adım Çözüm

1
Identify the turning path geometry of commercial vehicles
Rear wheels take a shorter path than front wheels during any turn, known as off-tracking or cheating.
Vehicle length and wheelbase cause the rear axle to track inward toward the center of the turning radius.
2
Apply the rule for left-turn intersection positioning
Pulling forward to the center of the intersection before initiating the steering input keeps the rear of the vehicle safely clear of oncoming lanes.
Turning too early causes the rear axle to cut across the yellow dividing line or oncoming turn bay, creating a head-on collision risk.

Anahtar Kavram

Off-tracking prevention during intersection left turns
Tahmini Süre:45s
Soru 10Soru →

A commercial driver is planning a right turn at an urban intersection where the cross-street has limited clearance. If the turn requires extra room because of trailer off-tracking, which maneuver is correct?

Cevabı ve açıklamayı göster

Cevap: Keep the rear of the vehicle close to the right curb on approach, and swing wide into the cross-street as the turn is completed.

Cevap

Keep the rear of the vehicle close to the right curb on approach, and swing wide into the cross-street as the turn is completed.
Executing a proper button-hook turn requires keeping the rear wheels close to the right curb when approaching the intersection to prevent vehicles from passing on the right side. The driver then swings wide into the cross-street as the turn is being completed to provide sufficient clearance for trailer off-tracking.

Adım Adım Çözüm

1
Analyze the turning mechanics and risks of right turns with a combination vehicle.
Identify that rear wheels follow a shorter path than front wheels (off-tracking).
Off-tracking causes trailer wheels to cut across curbs, sidewalks, and roadside objects unless compensated for properly.
2
Evaluate the correct setup procedure to block trailing vehicles and manage space.
Determine that a button-hook maneuver is required rather than a jug-handle maneuver.
Keeping the vehicle's right side close to the curb prevents other drivers from passing on the right, and swinging wide only upon entering the cross-street safely accommodates off-tracking.

Anahtar Kavram

Proper Right-Turn Space Management (Button-Hook Turn vs. Jug-Handle)
Tahmini Süre:1m 0s
Soru 11Soru →

When preparing to make a left turn at an intersection with two designated left-turn lanes, a commercial driver should always choose the right-hand (outside) left-turn lane rather than the inside left-turn lane.

Cevabı ve açıklamayı göster

Cevap: True

Cevap

True. Commercial drivers should always select the right-hand (outside) lane when multiple left-turn lanes are present.
The statement is correct because official commercial driver guidelines specify that when multiple left-turn lanes exist, drivers must always select the right-hand (outside) lane. This positioning provides maximum visibility, prevents off-tracking conflicts on the vehicle's right side, and eliminates the need to swing wide across active traffic lanes.

Adım Adım Çözüm

1
Identify the intersection layout and lane configuration
The driver encounters an intersection offering two separate designated left-turn lanes.
Large vehicles require specific lane positioning to manage off-tracking geometry.
2
Apply standard commercial vehicle turning rules for dual left-turn lanes
Position the vehicle in the outside (right-hand) left-turn lane.
Starting from the inside lane often forces the driver to swing wide to the right mid-turn, creating blind-spot collision hazards with vehicles alongside.

Anahtar Kavram

Lane selection in dual left-turn intersections to accommodate vehicle off-tracking
Tahmini Süre:45s
Soru 12Soru →

A commercial driver is preparing to make a sharp right turn at an intersection with narrow streets and tight curb radii. To properly compensate for off-tracking while preventing trailing vehicles from attempting to pass on the right, how should the driver position and steer the vehicle?

Cevabı ve açıklamayı göster

Cevap: Keep the rear of the vehicle close to the right curb upon approach, proceed forward into the intersection past the corner, and swing wide into the cross street as the turn is completed.

Cevap

Keep the rear of the vehicle close to the right curb upon approach, proceed forward into the intersection past the corner, and swing wide into the cross street as the turn is completed.
The correct method for making a tight right turn in a commercial motor vehicle is the button-hook maneuver. By keeping the rear of the vehicle close to the right curb during approach, the driver prevents other motorists from attempting to pass on the right. Proceeding deep into the intersection before turning allows the front wheels to swing wide into the cross street, ensuring that off-tracking rear wheels safely clear the corner curb without climbing the sidewalk or striking roadside obstacles.

Adım Adım Çözüm

1
Analyze vehicle approach alignment to manage adjacent lane space
Determine that the vehicle must remain close to the right curb during approach to block following traffic from attempting to pass on the right side.
Commercial combination vehicles create large blind spots on the right; opening space before a turn invites dangerous right-side squeeze crashes.
2
Establish the turning apex to accommodate trailer off-tracking
Proceed straight forward into the intersection until the cab reaches the center of the cross street before turning the steering wheel.
Because rear wheels follow a shorter path than front wheels (off-tracking), entering deeper into the intersection provides the necessary clearance for the trailer to clear the curb.
3
Select the correct exit path into the cross street
Complete the turn by swinging wide into the cross street (button-hook maneuver) rather than swinging wide on approach (jug-handle).
Swinging wide into the cross street maintains visual control of oncoming traffic while keeping trailing traffic safely behind the vehicle.

Anahtar Kavram

Execution of a button-hook right turn to manage off-tracking and prevent right-side squeeze accidents
Tahmini Süre:1m 30s
Soru 13Soru →

When executing a proper button-hook right turn to manage space and off-tracking in a commercial vehicle, in what sequence should a driver perform these steps? Arrange the actions from first to last.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

1. Position close to the right curb on approach; 2. Signal and monitor mirrors; 3. Drive straight forward into the intersection before turning; 4. Complete the turn wide into the receiving roadway.
A safe button-hook right turn requires keeping close to the right curb upon approach to prevent passing on the right, signaling and monitoring mirrors, driving forward into the intersection before steering, and completing the turn wide into the destination street to accommodate off-tracking.

Adım Adım Çözüm

1
Maintain vehicle positioning close to the right curb during the approach.
Blocks trailing vehicles from attempting to pass on the right.
Leaving space to the right tempts other motorists to squeeze into the vehicle blind spot.
2
Activate the right turn signal and check mirrors.
Communicates turning intent to surrounding drivers and verifies clear clearance.
Commercial drivers must alert traffic and maintain spatial awareness before initiating intersection maneuvers.
3
Pull straight out into the intersection before initiating the right turn.
Avoids swinging wide to the left beforehand and aligns the combination vehicle properly.
Swinging wide to the left first invites following vehicles to pass on the right side.
4
Turn wide into the cross street to finish the maneuver.
The rear trailer axles track inside the front wheels without climbing the curb.
Trailer off-tracking causes rear wheels to follow a tighter turning radius than the tractor.

Anahtar Kavram

Button-hook turn procedure and space management for off-tracking
Tahmini Süre:45s
Soru 14Soru →

When executing a right turn onto a narrow two-lane street, a commercial driver may need to temporarily cross the center line of the destination street to accommodate trailer off-tracking. If an oncoming vehicle advances to the intersection in that opposing lane during this maneuver, the commercial driver must stop and reverse the combination vehicle to clear the lane, because the commercial vehicle is occupying an oncoming lane.

Cevabı ve açıklamayı göster

Cevap: False

Cevap

The statement is False. A commercial driver must never back up in an intersection to clear a lane during a turn.
The statement is false. According to commercial driving standards, if you must cross into an oncoming lane to make a right turn and a vehicle approaches, you must hold your position. You should never back up, because you cannot see directly behind the trailer and risk hitting a vehicle that has pulled up behind you.

Adım Adım Çözüm

1
Analyze the right-turn space management scenario involving a narrow destination street.
The tractor must cross the center line of the destination street to accommodate trailer off-tracking, which is a proper button-hook turn.
Keeping the trailer close to the right curb prevents dangerous right-side passing, even if it requires the tractor to temporarily enter the opposing lane.
2
Evaluate the traffic conflict created when an oncoming vehicle approaches.
The combination vehicle is blocking the oncoming vehicle's legal lane of travel.
The wide turning radius inherently requires occupying this space temporarily.
3
Apply CDL safety regulations regarding reversing in intersections to resolve the conflict.
The CDL manual explicitly prohibits backing up in this situation.
Reversing a tractor-trailer creates a severe blind-spot hazard, risking a collision with unseen vehicles directly behind the trailer.

Anahtar Kavram

Intersection Space Management and Reversing Hazards
Tahmini Süre:45s
Soru 15Soru →

When maneuvering a combination commercial motor vehicle through a tight right turn that requires additional turning room, what is the proper sequence of driver actions? Arrange the following steps in the correct chronological order from initial approach to turn completion.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The proper chronological order begins with activating the turn signal and slowing down, followed by keeping the rear close to the curb to block right-side passing, then driving straight into the intersection past the corner before turning, and finally swinging wide into the cross street to clear the curb.
A safe button-hook right turn requires the driver to signal early and decelerate, maintain close proximity to the right curb on approach to prevent right-side passing, pull straight into the intersection past the corner, and swing wide into the cross street to account for trailer off-tracking.

Adım Adım Çözüm

1
Signal early and reduce speed
Traffic behind and ahead is alerted to the upcoming maneuver, and vehicle speed is controlled.
Drivers must communicate their intent before making lane or speed adjustments.
2
Position the vehicle close to the right curb line
The space to the right side of the combination vehicle remains closed.
Prevents other vehicles from attempting to squeeze past in the blind area on the right side.
3
Drive straight forward into the intersection past the corner curb
The tractor is positioned properly for a button-hook turn without creating a gap on approach.
Swinging wide to the left prior to entering the intersection opens an inviting gap for other motorists to pass on the right.
4
Complete the turn by swinging wide into the destination roadway
The trailer rear wheels follow the off-tracking path safely clear of the sidewalk and curb.
Because combination vehicles off-track, the rear wheels follow a shorter path than the front wheels, requiring extra room in the receiving street.

Anahtar Kavram

Button-Hook Right Turn Execution and Off-Tracking Management
Tahmini Süre:1m 0s
Soru 16Soru →

A heavy combination vehicle is executing a tight 90-degree right turn where substantial off-tracking is expected. Arrange the procedural steps in the correct chronological order from approach to completion to execute a safe button-hook turn without creating squeeze-play hazards.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct procedural order is: (1) Maintain vehicle position close to the right curb during approach, (2) Drive straight out into the intersection past the curb line, (3) Turn wide into the receiving cross-street while checking mirrors for off-tracking, and (4) Center the unit in the travel lane and cancel the turn signal.
According to commercial driving safety standards, a proper right turn with a long combination vehicle requires a 'button-hook' maneuver. The driver must first keep the rear of the vehicle close to the curb during the approach to close off the right side to other traffic. Second, the driver pulls straight into the intersection before turning. Third, the driver turns wide as they enter the cross-street (not on the approach), closely watching the trailer's off-tracking path in the right mirror. Finally, the driver straightens the vehicle into the proper traffic lane and cancels the turn indicator.

Adım Adım Çözüm

1
Set up the approach along the right curb line.
Prevents trailing vehicles from squeezing into the right-side blind area.
Commercial motor vehicles must deny space on the right side prior to the turn to avoid trapping other road users.
2
Advance straight into the intersection beyond the corner.
Positions the drive axles and trailer pivot point deep enough to clear the corner curb.
Off-tracking causes rear wheels to follow a significantly tighter path than the front wheels.
3
Execute the turn by swinging wide into the cross-street (button-hook).
Completes the directional change using available space in the cross-street rather than encroaching on oncoming traffic prior to the intersection.
Swinging wide late in the turn (in the cross-street) keeps following traffic aware and prevents premature lane encroachment on the approach.
4
Align the tractor-trailer combination in the proper travel lane and cancel the signal.
Restores normal traffic flow and establishes lane discipline on the new roadway.
Finalizes the maneuver once the rear trailer tandem has completely cleared the turning radius.

Anahtar Kavram

Button-Hook Right Turn Execution and Trailer Off-Tracking Management
Tahmini Süre:2m 0s
Soru 17Soru →

During a turn, the phenomenon known as off-tracking (or 'cheating') affects commercial motor vehicles. Which of the following correctly describes the path taken by the rear wheels relative to the front wheels during a turn?

Cevabı ve açıklamayı göster

Cevap: They follow a shorter path and cut inside the curve taken by the front wheels.

Cevap

The rear wheels follow a shorter path and cut inside the curve taken by the front wheels.
Due to off-tracking (also called 'cheating'), the rear wheels of any turning vehicle take a shorter path than the front wheels and cut inside the turning radius, requiring the commercial driver to compensate by allowing adequate clearance.

Adım Adım Çözüm

1
Identify the geometric principle of off-tracking in commercial vehicles.
Recognize that off-tracking (or 'cheating') describes the inward path difference between front steer wheels and rear axles.
Understanding turn geometry is essential for managing side space and preventing curb collisions.
2
Determine the relative trajectory of the rear wheels during a cornering maneuver.
The rear wheels follow a tighter, shorter radius arc compared to the front wheels.
Because the distance between steering and rear axles is fixed, rear tires must cut inside the curve.

Anahtar Kavram

Off-tracking causes the rear wheels of a turning commercial vehicle to travel along a shorter, more inward path than the front wheels.
Tahmini Süre:45s
Soru 18Soru →

A tractor-trailer is approaching a signalized four-way intersection to make a left turn onto a two-lane street. To prevent the trailer wheels from cutting the inside corner and striking vehicles stopped at the traffic signal, what steering path must the driver follow?

Cevabı ve açıklamayı göster

Cevap: Proceed straight until reaching the center of the intersection before beginning the turn.

Cevap

Proceed straight until reaching the center of the intersection before beginning the turn.
Reaching the center of the intersection before turning the steering wheel is the standard procedure for large commercial vehicles. Because the trailer's rear wheels follow a shorter path than the tractor's steer tires (off-tracking), driving forward into the center before initiating the turn ensures the trailer clears the inside curb and avoids oncoming vehicles waiting at the cross-street stop line.

Adım Adım Çözüm

1
Analyze the turning path geometry and off-tracking characteristics of combination vehicles.
The rear trailer wheels follow a significantly shorter path than the front steering wheels (off-tracking).
Because of off-tracking, any premature turning maneuver pulls the rear wheels across the inside of the intended curve.
2
Determine the proper intersection positioning for a left turn.
The driver must bring the vehicle forward into the center of the intersection before turning the steering wheel.
Bringing the tractor to the center of the intersection gives the trailer adequate clearance to clear the inside corner and avoid vehicles stopped at the cross-street stop line.

Anahtar Kavram

Left-Turn Intersection Positioning and Off-Tracking Mitigation
Tahmini Süre:1m 0s
Soru 19Soru →

When preparing to make a sharp right turn in a commercial motor vehicle, swinging wide to the left before initiating the turn is the correct technique to ensure adequate turning room for the trailer.

Cevabı ve açıklamayı göster

Cevap: False

Cevap

False
The statement is false because commercial drivers must avoid swinging wide to the left before initiating a right turn. Doing so misleads following drivers into thinking the truck is turning left, tempting them to pass on the right side. The correct method is to keep the rear wheels close to the right curb and swing wide as the turn is completed into the destination lane.

Adım Adım Çözüm

1
Analyze the hazard created by swinging wide to the left prior to a right turn.
Swinging left creates a wide gap between the vehicle and the right curb, inviting trailing drivers to pass on the right side.
Commercial vehicles have large blind spots on the right, and trapping a passing motorist against the curb as the truck turns right causes severe collisions.
2
Identify the standard commercial driving procedure for managing off-tracking during right turns.
The driver must execute a button-hook turn by staying close to the right curb upon approach and swinging wide into the destination street only as the turn is completed.
This blocks following vehicles from attempting to pass on the right and protects the space needed for rear wheel off-tracking.

Anahtar Kavram

Proper right-turn space management (button-hook turn versus hazardous jug-handle turn)
Tahmini Süre:45s
Soru 20Soru →

A commercial driver transitions from operating a short 30-foot straight truck to driving a 53-foot tractor-trailer combination. How does this increase in vehicle length affect off-tracking when making turns?

Cevabı ve açıklamayı göster

Cevap: The rear wheels will follow a substantially shorter path inside the turn, requiring significantly more space to clear obstacles.

Cevap

The rear wheels will follow a substantially shorter path inside the turn, requiring significantly more space to clear obstacles.
Off-tracking (also known as 'cheating') occurs because rear wheels always follow a shorter path than the front wheels during a turn. The greater the distance between the front wheels and the rear wheels, the greater the off-tracking. Therefore, moving from a 30-foot straight truck to a 53-foot combination significantly increases the inward path deviation of the rear wheels, demanding larger space buffers.

Adım Adım Çözüm

1
Identify the fundamental physical principle of off-tracking in commercial vehicles.
In any turning vehicle, the rear wheels travel along a shorter, tighter radius than the front steer wheels.
The fixed rear axles do not steer and naturally cut across the inside of the curve.
2
Analyze how increasing vehicle length and wheelbase impacts off-tracking distance.
As the distance between the front axle and rear axles increases, the off-tracking effect becomes substantially larger.
Longer wheelbases force the rear wheels to cheat farther inward, increasing the risk of striking curbs, pedestrians, or adjacent vehicles.

Anahtar Kavram

Relationship between vehicle length/wheelbase and off-tracking severity
Tahmini Süre:45s
Sayfa 1 / 2Sonraki