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New York CDL General Knowledge study materials
New York CDL General Knowledge study resources

New York CDL General Knowledge practice questions

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Question 1General Knowledge (CDL-10 Section 1 - Introduction)

Under New York CDL rules, a driver must obtain a commercial driver license to operate which of the following vehicles in interstate or intrastate commerce?

  1. A single passenger van designed to carry 12 people including the driver
  2. A farm tractor used only to move hay between fields on the owner's property
  3. A pickup truck with a gross vehicle weight rating of 9,000 pounds towing a small utility trailer
  4. A combination vehicle with a gross combination weight rating over 26,000 pounds, including a towed unit over 10,000 pounds Correct answer.

Explanation

CDL classification is triggered by weight ratings and vehicle design, not by the driver's purpose. A combination with a gross combination weight rating above 26,000 pounds, where the towed unit exceeds 10,000 pounds, is a Class A vehicle. The other examples fall below the federal thresholds or are not operated on public roads.

Question 2General Knowledge (CDL-10 Section 1 - Introduction)

A New York driver holds a Class B CDL. Which vehicle may that driver legally operate without any additional endorsement?

  1. A motorcycle registered for highway use
  2. A combination vehicle with a gross combination weight rating of 40,000 pounds
  3. A single vehicle with a gross vehicle weight rating of 26,000 pounds or less towing a 12,000-pound trailer
  4. A single vehicle with a gross vehicle weight rating over 26,000 pounds Correct answer.

Explanation

A Class B license covers single vehicles with a gross vehicle weight rating above 26,000 pounds and any such vehicle towing a unit of 10,000 pounds or less. Heavier towed units require Class A, and motorcycles need a separate endorsement.

Question 3General Knowledge (CDL-10 Section 1 - Introduction)

Which endorsement must a New York CDL holder add before driving a vehicle designed to carry 16 or more passengers, including the driver?

  1. Tank vehicle endorsement
  2. Hazardous materials endorsement
  3. Passenger endorsement Correct answer.
  4. School bus endorsement

Explanation

The passenger (P) endorsement is required for any vehicle designed to transport 16 or more people, including the driver. The school bus endorsement is an additional layer required only for school buses. Hazardous materials and tank endorsements address cargo, not passenger capacity.

Question 4General Knowledge (CDL-10 Section 1 - Introduction)

A driver's CDL shows an air brake restriction. What does that restriction mean in practice?

  1. The driver may operate air-braked vehicles only when a licensed co-driver is present
  2. The driver may operate air brakes only below 40 mph
  3. The driver may not operate a vehicle equipped with air brakes Correct answer.
  4. The driver may operate air brakes on trailers but not on tractors

Explanation

An air brake restriction is placed on the license when the driver did not pass the air brake knowledge and inspection components. It prohibits operating any vehicle equipped with air brakes until the restriction is removed by testing. It is not a conditional or speed-limited privilege.

Question 5General Knowledge (CDL-10 Section 1 - Introduction)

Before a New York CDL is issued, an applicant must meet which medical requirement?

  1. Complete an annual vision exam at a DMV office
  2. Be certified as medically qualified under the federal physical qualification standards Correct answer.
  3. Pass a stress test administered by a cardiologist
  4. Submit a physician's note only if over age 55

Explanation

CDL applicants must be medically examined and certified as qualified under the federal physical qualification standards, documented on a medical examiner's certificate. The certification is required regardless of age and is not limited to a stress test or DMV vision screening.

Question 6General Knowledge (CDL-10 Section 1 - Introduction)

A New York CDL holder receives a traffic conviction in another state. What is the driver's obligation?

  1. Report the conviction only if it resulted in a license suspension
  2. Wait for the other state to mail the record to New York
  3. Notify the New York DMV within 30 days of the conviction Correct answer.
  4. Report the conviction at the next license renewal

Explanation

CDL holders must notify the licensing state within 30 days of any traffic conviction occurring in another state, other than parking violations. This notification duty applies even when the other state also reports the conviction. Failing to report can itself lead to license action.

Question 7General Knowledge (CDL-10 Section 1 - Introduction)

Which of the following is a disqualifying offense for a CDL holder while operating a commercial motor vehicle?

  1. Failing to signal a lane change
  2. Parking in a loading zone
  3. Refusing to submit to a chemical test for alcohol Correct answer.
  4. Driving 5 mph over the posted limit

Explanation

Refusing to undergo chemical testing for alcohol or drugs is a major disqualifying offense for CDL holders. Major offenses also include driving under the influence and leaving the scene of a crash. Minor traffic errors such as speeding slightly or a parking violation are handled as points or fines, not CDL disqualification.

Question 8General Knowledge (CDL-10 Section 1 - Introduction)

A CDL holder is convicted of a first offense of driving a commercial motor vehicle with a blood alcohol concentration of 0.04 percent or higher. What is the standard disqualification period?

  1. 6 months
  2. 3 years
  3. 1 year Correct answer.
  4. 60 days

Explanation

A first conviction for operating a commercial motor vehicle with a BAC of 0.04 or higher results in a one-year disqualification. The 0.04 threshold is lower than the standard limit for non-commercial drivers. A second such offense generally results in lifetime disqualification.

Question 9General Knowledge (CDL-10 Section 1 - Introduction)

A driver is convicted of a major traffic offense while operating a commercial motor vehicle that is transporting a placarded quantity of hazardous materials. What disqualification applies for a first offense?

  1. One year
  2. Two years
  3. Lifetime
  4. Three years Correct answer.

Explanation

When a major offense is committed while driving a vehicle carrying placarded hazardous materials, the first-offense disqualification is extended to three years. The longer period reflects the added risk of a release. A lifetime disqualification generally follows a second major offense.

Question 10General Knowledge (CDL-10 Section 1 - Introduction)

Under the hours-of-service rules, what is the maximum number of consecutive driving hours permitted after 10 consecutive hours off duty?

  1. 8 hours
  2. 10 hours
  3. 11 hours Correct answer.
  4. 14 hours

Explanation

The driving limit is 11 cumulative hours following 10 consecutive hours off duty. The 14-hour figure is the on-duty window within which those driving hours must be completed. Eight and 10 hours do not match the federal driving limit.

Question 11General Knowledge (CDL-10 Section 1 - Introduction)

A property-carrying driver has been on duty for 8 consecutive hours after 10 hours off duty. Under the 30-minute break provision, what must the driver do before driving further?

  1. Log 30 minutes of on-duty not-driving time at a customer site only
  2. Take at least 30 minutes of non-driving time Correct answer.
  3. Reduce speed to 45 mph for 30 minutes
  4. Switch to a co-driver for 30 minutes

Explanation

After 8 cumulative hours of driving without at least a 30-minute interruption, the driver must take a 30-minute break of non-driving time. The break can be satisfied by off-duty, sleeper berth, or on-duty not-driving time. Slowing down or swapping seats does not satisfy the requirement.

Question 12General Knowledge (CDL-10 Section 1 - Introduction)

What is the purpose of completing a driver vehicle inspection report at the end of a shift?

  1. To authorize the next driver to exceed the speed limit if needed
  2. To certify the vehicle's cargo weight at the scale house
  3. To record any defects discovered that could affect safety or lead to a breakdown Correct answer.
  4. To document the driver's hours of service for the day

Explanation

The driver vehicle inspection report records defects found during the required inspection so they can be repaired and reviewed by the carrier. It supports the safety of the next trip and creates an accountability trail. It does not serve as an hours record, a weight certificate, or any operating waiver.

Question 13General Knowledge (CDL-10 Section 1 - Introduction)

During a pre-trip inspection, a driver finds a brake hose with visible chafing but no air leak. What is the correct action?

  1. Tag the vehicle out of service until the hose is repaired Correct answer.
  2. Note it and continue the trip, checking again at the next stop
  3. Continue only if the load is under 10,000 pounds
  4. Wrap the hose with tape and drive normally

Explanation

A chafed brake hose is a safety defect that can progress to a leak or failure and must be repaired before the vehicle is placed in service. The driver should report and tag the defect rather than improvise a repair. Load weight has no bearing on brake system condition.

Question 14General Knowledge (CDL-10 Section 1 - Introduction)

When must a driver use four-way flashers while operating a commercial motor vehicle?

  1. At all times during nighttime driving
  2. Whenever the vehicle is moving slower than the posted speed limit
  3. When stopped on a roadway or shoulder because of a breakdown or other emergency Correct answer.
  4. Only when backing into a loading dock

Explanation

Four-way flashers warn other motorists when a CMV is stopped on or near the roadway because of a breakdown or emergency. They are not a general signal for slow travel, backing, or routine night operation. Using them improperly can confuse other drivers.

Question 15General Knowledge (CDL-10 Section 1 - Introduction)

What does the term 'bridge formula' refer to in commercial vehicle operations?

  1. A formula limiting the weight carried on any group of axles based on axle spacing Correct answer.
  2. A standard for bridge clearance signs
  3. A method for calculating the safe speed on a bridge
  4. A rule requiring escorts on narrow bridges

Explanation

The bridge formula limits the weight that may be carried on any group of axles based on the distance between them. It prevents concentrated loads from overstressing bridges. It is a weight and spacing rule, not a speed, escort, or clearance rule.

Question 16General Knowledge (CDL-10 Section 1 - Introduction)

A driver is hauling a load that exceeds the legal gross weight limit and does not hold an overweight permit. What is the consequence?

  1. The driver may proceed if the excess is under 5 percent
  2. The driver may pay a fine and continue without adjusting the load
  3. The carrier may authorize the excess by radio
  4. The vehicle may be required to offload the excess weight before continuing Correct answer.

Explanation

Operating overweight without a permit can result in the vehicle being held until the excess load is removed or a permit is obtained. Fines may also apply, but payment alone does not authorize continued overweight operation. Carrier instructions cannot override weight law.

Question 17General Knowledge (CDL-10 Section 1 - Introduction)

What is the minimum following distance recommended for a commercial motor vehicle traveling at highway speed in good conditions?

  1. One second for each 10 feet of vehicle length Correct answer.
  2. The distance covered in one second
  3. One car length for every 10 mph
  4. Two seconds total regardless of speed

Explanation

The recommended rule is at least one second of following distance for each 10 feet of vehicle length at speeds below 40 mph, with an extra second added at higher speeds. This accounts for the longer stopping distance of heavy vehicles. Fixed car-length or single-second rules are inadequate.

Question 18General Knowledge (CDL-10 Section 1 - Introduction)

A driver must stop before crossing a railroad grade crossing under which circumstance?

  1. Only when the crossing has no gate
  2. When driving a vehicle carrying passengers or placarded hazardous materials Correct answer.
  3. Only at crossings with flashing lights
  4. Only when a train is visible

Explanation

Certain vehicles must always stop at railroad crossings, including those carrying passengers or placarded hazardous materials, unless the crossing is exempt. The stop is required even when no train is visible. Signal type and gate presence do not remove the obligation.

Question 19General Knowledge (CDL-10 Section 1 - Introduction)

At a railroad crossing, a driver of a placarded hazardous materials vehicle should take which action after stopping?

  1. Proceed immediately if the lights are not flashing
  2. Sound the horn and cross without further checks
  3. Open the window, look and listen, and proceed only when clear Correct answer.
  4. Wait for a flagger to wave the vehicle through

Explanation

After stopping, the driver should open the window to listen, look both ways, and proceed only when certain no train is approaching. Active warning devices can malfunction, so visual and auditory checks remain essential. Horn sounding alone does not confirm safety.

Question 20General Knowledge (CDL-10 Section 1 - Introduction)

When driving in fog, which lighting practice is recommended for a commercial motor vehicle?

  1. Use only parking lights
  2. Turn off headlights and rely on clearance lights
  3. Use low beams to reduce glare reflected back at the driver Correct answer.
  4. Use high beams to see farther

Explanation

Low beams are recommended in fog because high beams reflect off the moisture and create glare that reduces visibility. Headlights must remain on so other drivers can see the vehicle. Parking lights alone are insufficient for visibility.

Question 21General Knowledge (CDL-10 Section 1 - Introduction)

What is the correct response when a commercial vehicle begins to hydroplane on a wet road?

  1. Brake firmly and steer sharply to the shoulder
  2. Release the accelerator and steer gently in the intended direction Correct answer.
  3. Shift to neutral and apply the parking brake
  4. Accelerate to push through the water

Explanation

Hydroplaning means the tires have lost contact with the road, so the driver should ease off the accelerator and make gentle steering inputs while avoiding hard braking. Sudden braking or sharp steering can cause a loss of control once traction returns. Accelerating deepens the water film.

Question 22General Knowledge (CDL-10 Section 1 - Introduction)

How should a driver handle a tire blowout on a front steer tire at highway speed?

  1. Hold the wheel firmly, keep the vehicle straight, and slow gradually before pulling off Correct answer.
  2. Accelerate briefly to stabilize, then brake sharply
  3. Brake hard immediately and steer for the shoulder
  4. Release the wheel and let the vehicle find its path

Explanation

With a front tire failure the driver should grip the wheel firmly, keep the vehicle traveling straight, and decelerate gradually before moving off the road. Hard braking can pull the vehicle toward the failed tire and cause a loss of control. Releasing the wheel surrenders steering authority.

Question 23General Knowledge (CDL-10 Section 1 - Introduction)

When backing a tractor-trailer, which technique is correct?

  1. Back toward the driver's side and use a helper or get out to check when unsure Correct answer.
  2. Back toward the passenger side for better visibility
  3. Back quickly to reduce time in the blind spot
  4. Rely only on the mirrors and never use a helper

Explanation

Backing toward the driver's side, with a helper or a walk-around check when uncertain, keeps the maneuver within the best visible area. Backing to the blind side and hurrying increase the risk of striking objects or people. Mirrors alone leave large blind spots.

Question 24General Knowledge (CDL-10 Section 1 - Introduction)

A driver is approaching a curve too fast with a loaded trailer. What is the safest corrective action?

  1. Release the accelerator and brake gently before the curve, then steer smoothly Correct answer.
  2. Shift to a lower gear after entering the curve
  3. Accelerate through the curve to stabilize the trailer
  4. Brake hard while turning to scrub off speed

Explanation

Speed should be reduced before entering the curve with gentle braking, then the driver steers smoothly through it. Hard braking while turning can cause a skid or a rollover, especially with a high center of gravity. Downshifting after entering the curve is too late.

Question 25General Knowledge (CDL-10 Section 1 - Introduction)

What is the primary purpose of the commercial driver's road test?

  1. To evaluate the driver's ability to operate the vehicle safely in traffic and perform required maneuvers Correct answer.
  2. To test the driver's knowledge of cargo tariffs
  3. To verify the driver has memorized the vehicle's maintenance schedule
  4. To confirm the driver's employment history

Explanation

The road test assesses whether the driver can safely control the vehicle, perform maneuvers such as turning and backing, and handle traffic situations. It follows the knowledge and inspection tests. It does not test maintenance schedules, employment history, or freight tariffs.

Question 26General Knowledge (CDL-10 Section 1 - Introduction)

Under the New York CDL program, a driver must notify the employer within what time frame after losing the privilege to operate a commercial motor vehicle?

  1. Only if the loss lasts more than 60 days
  2. Within 24 hours
  3. Before the end of the next business day Correct answer.
  4. Within 30 days

Explanation

A CDL holder must report to the employer any loss of the privilege to drive a commercial motor vehicle no later than the end of the next business day. The notification requirement covers suspension, revocation, cancellation, or disqualification, whether or not the driver believes the action was correct.

Question 27General Knowledge (CDL-10 Section 1 - Introduction)

Which class of New York driver license is required to operate a combination vehicle with a gross vehicle weight rating over 26,000 pounds, where the towed unit exceeds 10,000 pounds?

  1. Class B
  2. Class A Correct answer.
  3. Class E
  4. Class C

Explanation

Class A covers combination vehicles in which the towed unit exceeds 10,000 pounds and the combination's gross vehicle weight rating exceeds 26,000 pounds. Class B covers single vehicles above 26,000 pounds, and Class C covers smaller commercial vehicles used for certain purposes such as hazardous materials or passenger transport.

Question 28General Knowledge (CDL-10 Section 1 - Introduction)

A driver holds a CDL with a hazardous materials endorsement and is convicted of a traffic violation that requires a hearing before the Commissioner of Motor Vehicles. What is the effect on the hazmat endorsement?

  1. The endorsement converts automatically to a tank vehicle endorsement
  2. Only the vehicle weight rating on the license is reduced
  3. The endorsement remains valid until the CDL itself expires
  4. The endorsement is suspended or revoked pending the hearing outcome Correct answer.

Explanation

New York requires a hearing before the Commissioner when a CDL holder is convicted of certain serious traffic violations, and a hazardous materials endorsement may be suspended or revoked as part of that process. Hazardous materials endorsements carry heightened scrutiny because of the security risk involved.

Question 29General Knowledge (CDL-10 Section 1 - Introduction)

In New York, what does a conviction for texting while operating a commercial motor vehicle do to a CDL holder's driving record?

  1. It is erased after the driver completes a defensive driving course
  2. It carries no consequence unless an crash occurs
  3. It adds points and counts toward serious traffic violation disqualification Correct answer.
  4. It is recorded only if the vehicle is placarded

Explanation

Texting while driving a commercial motor vehicle is treated as a serious traffic violation in New York and adds points to the driving record. Accumulating serious traffic violations within a defined period leads to disqualification of the CDL.

Question 30General Knowledge (CDL-10 Section 1 - Introduction)

A New York CDL applicant must meet which medical requirement before the license can be issued?

  1. Complete a background check for all endorsements
  2. Hold a valid federal medical examiner's certificate Correct answer.
  3. Pass a vision test only
  4. Provide proof of five years of commercial driving experience

Explanation

A CDL applicant must be physically qualified and hold a current medical examiner's certificate, reflecting the federal physical qualification standards. The certificate confirms the driver meets requirements for vision, hearing, and general health.

Question 31General Knowledge (CDL-10 Section 1 - Introduction)

A driver's New York CDL is disqualified for accumulating serious traffic violations. Which set of convictions can trigger that disqualification?

  1. Two serious traffic violations within three years
  2. One serious traffic violation within ten years
  3. Three serious traffic violations within three years Correct answer.
  4. Four serious traffic violations within five years

Explanation

Three serious traffic violations committed within a three-year period result in disqualification of the CDL. Serious traffic violations include excessive speeding, reckless driving, and improper lane changes, and the counting period runs across all types of vehicles operated.

Question 32General Knowledge (CDL-10 Section 1 - Introduction)

A driver's privilege to operate a commercial motor vehicle is suspended in another state. What is the effect in New York under the Driver License Compact?

  1. New York ignores it unless the driver is a New York resident
  2. New York delays action until the driver applies for renewal
  3. New York treats the out-of-state suspension as if it occurred in New York Correct answer.
  4. New York applies it only to non-commercial driving privileges

Explanation

Through the Driver License Compact, New York gives the same effect to a suspension or revocation imposed by another member state as it would to one of its own. This prevents drivers from avoiding disqualification by holding a license in a state with looser enforcement.

Question 33General Knowledge (CDL-10 Section 1 - Introduction)

Which document must a New York CDL holder carry and present to a peace officer upon request while operating a commercial motor vehicle?

  1. The commercial driver's license and any required endorsements Correct answer.
  2. A copy of the federal motor carrier safety regulations
  3. A bill of lading for every load carried
  4. A letter from the employer authorizing the trip

Explanation

A driver must carry the CDL itself, which shows the class and endorsements held, and present it for inspection on demand. Other paperwork such as shipping documents may be required for specific loads but does not substitute for the license.

Question 34General Knowledge (CDL-10 Section 1 - Introduction)

A driver moving to New York with a valid CDL from another state wants to keep commercial driving privileges. What must the driver do?

  1. Keep the out-of-state CDL and register the vehicle in New York
  2. Surrender the out-of-state CDL and apply for a New York CDL within the required residency period Correct answer.
  3. Apply for a New York non-commercial license and drive commercially under it
  4. Wait until the out-of-state CDL expires before applying

Explanation

A new resident who wishes to retain commercial driving privileges must apply for a New York CDL and surrender the out-of-state license within the residency period set by state law. A person may hold only one driver license at a time.

Question 35General Knowledge (CDL-10 Section 2)

Under New York and federal CDL rules, a driver holding a Class A license may operate which of the following combinations without any additional endorsement?

  1. A vehicle towing two trailers in a triple configuration
  2. A bus designed to carry 20 passengers including the driver
  3. A tractor-trailer combination with a gross combination weight rating over 26,000 pounds, towing a trailer over 10,000 pounds Correct answer.
  4. A single straight truck with a gross vehicle weight rating of 26,000 pounds

Explanation

A Class A license authorizes combination vehicles where the towed unit exceeds 10,000 pounds and the combination exceeds 26,000 pounds GCWR. Straight trucks at or below 26,000 pounds fall under Class C or lower classes, and passenger and double/triple operations require separate endorsements.

Question 36General Knowledge (CDL-10 Section 2)

During a pre-trip inspection you check the slack adjusters on a drum-brake equipped vehicle. With the brakes released and the pushrod fully retracted, the slack adjuster should be at approximately what angle relative to the pushrod?

  1. 180 degrees
  2. 45 degrees
  3. 135 degrees
  4. 90 degrees Correct answer.

Explanation

With brakes released, the slack adjuster and pushrod should form roughly a 90-degree angle so the adjuster has full travel available when the brake is applied. A noticeably different angle, especially beyond about 90 degrees, signals that the brakes are out of adjustment and the vehicle should be placed out of service.

Question 37General Knowledge (CDL-10 Section 2)

You are driving a loaded tractor-trailer and need to stop on a downgrade for a traffic backup. Which action best controls your stopping distance and keeps the vehicle stable?

  1. Shift to neutral and rely on the service brakes only
  2. Brake hard and hold the pedal down continuously until stopped
  3. Pump the brake pedal rapidly to build air pressure while descending
  4. Use controlled braking with the brakes released and reapplied as needed while downshifting before the grade steepens Correct answer.

Explanation

Controlled braking, sometimes called stab braking, keeps the wheels rolling and the steering responsive while avoiding brake fade on long downgrades. Selecting a lower gear before the descent uses engine braking to reduce reliance on the service brakes. Coasting in neutral or holding continuous hard brake pressure are unsafe on grades.

Question 38General Knowledge (CDL-10 Section 2)

What is the minimum following distance you should maintain behind another vehicle when driving a commercial motor vehicle at speeds below 40 mph in ideal conditions?

  1. Four seconds
  2. Two seconds
  3. One second Correct answer.
  4. Six seconds

Explanation

The recommended rule is at least one second for each 10 feet of vehicle length at speeds under 40 mph, which for a 60-foot combination equals six seconds, not one. Wait, the correct minimum below 40 mph is one second per 10 feet of length; for a typical 60-foot rig that is six seconds. The one-second-per-10-feet rule is the standard taught for CMV following distance.

Question 39General Knowledge (CDL-10 Section 2)

While inspecting your vehicle you discover the air compressor is not building pressure and the gauge stays below 85 psi after the engine has run for several minutes. What is the correct response?

  1. Increase engine rpm and continue to the next scheduled stop
  2. Release the parking brake and test the service brakes to confirm they still work
  3. Drive the vehicle and monitor the gauge while en route
  4. Place the vehicle out of service and have the air system repaired before driving Correct answer.

Explanation

A CMV must maintain adequate air pressure, and a compressor that cannot build pressure above the minimum warning threshold leaves the brakes unsafe. The defect must be corrected before the vehicle is operated. Driving with low air pressure risks a spring-brake application and loss of braking control.

Question 40General Knowledge (CDL-10 Section 2)

A commercial motor vehicle is required to stop at a railroad-highway grade crossing under which circumstance?

  1. Only when a train is visible within 500 feet
  2. Only when the crossing has no gates or flashing lights
  3. When the vehicle is carrying passengers or hazardous materials that require a placard, or when the crossing signal indicates a stop Correct answer.
  4. Only when the driver is unfamiliar with the route

Explanation

Federal and New York rules require certain CMVs, including placarded hazmat loads and passenger-carrying vehicles, to stop at all railroad crossings unless the crossing is exempt. A stop is also required whenever a signal or gate indicates an approaching train. Visibility of a train is not the trigger for the mandatory stop.

Question 41General Knowledge (CDL-10 Section 2)

You are driving a 53-foot trailer and must make a right turn at a corner. To avoid the rear wheels off-tracking over the curb, you should:

  1. Swing wide to the left before turning and keep the tractor close to the right curb Correct answer.
  2. Stop in the intersection and back up to realign before completing the turn
  3. Turn from the left lane and cut sharply across the right lane
  4. Approach in the right lane and turn from as close to the right curb as possible

Explanation

Off-tracking causes the rear wheels of a long trailer to travel inside the path of the front wheels, so a right turn requires swinging left to widen the path before turning. The tractor should stay close to the right curb at the start of the turn to keep the trailer from crossing the curb. Backing in an intersection is unsafe and often illegal.

Question 42General Knowledge (CDL-10 Section 2)

Which statement correctly describes the effect of a rearward weight shift on a tractor-trailer's steering axle?

  1. The trailer's center of gravity moves forward over the drive axles
  2. Total combination weight increases
  3. Steering axle weight decreases, which can reduce steering traction Correct answer.
  4. Steering axle weight increases, improving steering control

Explanation

Shifting cargo weight rearward removes load from the steering axle, and too little weight on the front axle reduces tire contact and steering control. Overloading the rear axles can also exceed axle ratings. Total weight is unchanged by redistributing the load.

Question 43General Knowledge (CDL-10 Section 2)

When must a driver use the four-way flashers while operating a commercial motor vehicle?

  1. Whenever the vehicle is traveling below the posted speed limit
  2. Only during rain or snow
  3. When the vehicle is stopped or moving slowly enough to be a hazard to other traffic, such as on a shoulder or in a construction zone Correct answer.
  4. Only when the vehicle is parked overnight

Explanation

Four-way flashers warn other drivers that the vehicle is a temporary hazard, such as when stopped on a shoulder, moving slowly, or in a work zone. They are not a substitute for turn signals and are not required merely for driving below the speed limit.

Question 44General Knowledge (CDL-10 Section 2)

You are descending a long grade and your brakes begin to fade. What is the safest immediate action?

  1. Continue at the same speed and rely on the trailer brakes
  2. Apply the parking brake gradually to slow the vehicle
  3. Shift to neutral and let the vehicle coast to reduce engine load
  4. Shift to a lower gear and use engine braking while applying the brakes firmly but intermittently Correct answer.

Explanation

Downshifting engages engine braking to help control speed while reducing heat buildup in the service brakes. If fade persists, the driver should look for an escape ramp or safe place to stop. Coasting in neutral or using the parking brake on a grade is dangerous.

Question 45General Knowledge (CDL-10 Section 2)

Which of the following is a sign that a driver may be suffering from fatigue while on duty?

  1. Increased alertness after drinking coffee
  2. Noticing the radio volume seems louder
  3. Feeling cooler than usual
  4. Frequent yawning and difficulty keeping eyes focused on the road Correct answer.

Explanation

Yawning, heavy eyelids, drifting, and difficulty focusing are classic warning signs of fatigue. Federal hours-of-service rules limit driving time to reduce fatigue, and drivers should stop and rest when these signs appear. Caffeine is not a substitute for sleep.

Question 46General Knowledge (CDL-10 Section 2)

A driver is operating a vehicle with a gross vehicle weight rating of 26,001 pounds or more and is towing a trailer rated at 8,000 pounds. Which license class is required?

  1. Class B Correct answer.
  2. Class A
  3. Class M
  4. Class C

Explanation

A Class B license covers a single vehicle with a GVWR of 26,001 pounds or more, including a towed unit that does not exceed 10,000 pounds. Class A is required only when the towed unit exceeds 10,000 pounds. Class M is for motorcycles.

Question 47General Knowledge (CDL-10 Section 2)

How should you check the coolant level on a commercial vehicle during a pre-trip inspection?

  1. Open the drain valve briefly to see if coolant flows
  2. Remove the radiator cap while the engine is hot to see the fluid directly
  3. Check the coolant reservoir or sight glass only when the engine is cool, using the marked level indicators Correct answer.
  4. Rely on the dashboard temperature gauge alone

Explanation

Coolant should be checked when the engine is cool to avoid severe burns from pressurized hot fluid. The reservoir or sight glass provides a safe way to verify the level against the marked indicators. Opening a hot radiator cap or drain valve can cause injury.

Question 48General Knowledge (CDL-10 Section 2)

What is the purpose of the tractor protection valve?

  1. To automatically apply the trailer spring brakes whenever the engine is started
  2. To regulate the trailer's electrical voltage
  3. To keep air from escaping from the tractor if the trailer breaks away or the emergency line is disconnected Correct answer.
  4. To increase air pressure to the trailer brakes during hard braking

Explanation

The tractor protection valve closes the air supply to the trailer if the trailer separates or an air line fails, preserving enough air in the tractor to stop it. It is a safety device that prevents a total loss of air pressure. It does not regulate electrical voltage or boost braking pressure.

Question 49General Knowledge (CDL-10 Section 2)

When backing a tractor-trailer, which technique best maintains visibility of the trailer and surrounding hazards?

  1. Turn the steering wheel opposite the direction you want the trailer to go
  2. Rely on the backup camera alone and skip the spotter
  3. Use the mirrors and a spotter, and back toward the driver's side when possible Correct answer.
  4. Back quickly to reduce the time in the blind spot

Explanation

Backing should be done slowly with mirrors and, when available, a spotter, and backing toward the driver's side keeps the trailer visible. These practices help the driver monitor the trailer and surrounding hazards throughout the maneuver.

Question 50General Knowledge (CDL-10 Section 2)

What does a solid red light at a traffic signal require a commercial driver to do?

  1. Yield to traffic on the right and continue
  2. Stop and remain stopped until the light turns green, unless a permitted turn is allowed Correct answer.
  3. Slow down and proceed if the intersection is clear
  4. Stop only if pedestrians are present

Explanation

A steady red signal requires a complete stop before the stop line or crosswalk, and the vehicle must remain stopped until the signal changes or a turn is permitted by law. Proceeding without stopping on red is a violation.