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ID CDL General Knowledge study materials
ID CDL General Knowledge study resources

ID CDL General Knowledge practice questions

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Question 1Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a valid Class B commercial driver's license issued by one State and moves to another State. Under the one-State license rule, what must the driver do to keep driving commercial motor vehicles?

  1. Keep the old license and add a second CDL from the new State
  2. Continue using the old license indefinitely because CDLs never expire on relocation
  3. Apply for a CDL in the new home State within the time that State allows for new residents Correct answer.
  4. Surrender the CDL and drive only non-commercial vehicles for one year

Explanation

A CDL driver may hold a commercial license from only one State, and that State must be the driver's State of domicile. When domicile changes, the driver must obtain a CDL from the new home State within the residency period that State sets. Holding two CDLs at once is prohibited.

Question 2Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which document establishes the State that a CDL applicant must treat as the home State for licensing purposes?

  1. The State shown on the applicant's birth certificate
  2. The State of domicile, meaning the fixed place of residence the applicant intends to return to Correct answer.
  3. The State where the applicant currently pays rent
  4. The State where the applicant's employer is headquartered

Explanation

Federal CDL rules tie licensing to State of domicile, which is the fixed, permanent residence to which the person intends to return. Employers and prior addresses do not determine domicile. The applicant applies for the CDL in the domicile State.

Question 3Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant who holds a valid non-commercial driver's license from State A applies for a CDL in State B, where the applicant now lives. What does the one-license principle require?

  1. Mail the State A license to the employer for recordkeeping
  2. Surrender the State A license before State B issues the CDL Correct answer.
  3. Keep both licenses because one is commercial and one is not
  4. Wait two years before applying in State B

Explanation

A person may hold only one driver's license, and it must be issued by the State of domicile. When applying for a CDL in the new home State, the applicant surrenders any license from another State. This prevents a driver from holding licenses in multiple States.

Question 4Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What is the minimum age at which a person may be issued a commercial driver's license for intrastate operation under the Federal Motor Carrier Safety Regulations baseline?

  1. 21
  2. 18 Correct answer.
  3. 24
  4. 16

Explanation

The federal baseline allows a CDL to be issued at 18 for intrastate commercial operation. Drivers must be 21 to operate across State lines in interstate commerce or to haul hazardous materials. Individual States may impose stricter requirements.

Question 5Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver is 19 years old and holds a CDL. Which operation is permitted under the federal age rules?

  1. Transporting hazardous materials in interstate commerce
  2. Driving intrastate routes within the home State only Correct answer.
  3. Pulling interstate doubles trailers for a regional fleet
  4. Hauling general freight across State lines for a national carrier

Explanation

Drivers under 21 may operate commercial motor vehicles only within the State that issued the CDL. Interstate commerce and hazardous materials hauling require the driver to be at least 21. This keeps the 19-year-old restricted to intrastate work.

Question 6Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

How long must an applicant hold a commercial learner's permit before taking the CDL skills test, at a minimum under federal rules?

  1. 60 days
  2. 14 days Correct answer.
  3. 7 days
  4. 30 days

Explanation

Federal rules require the CLP to be held for at least 14 days before the applicant takes the CDL skills test. The knowledge tests may be taken earlier. The waiting period gives the learner time to practice under supervision.

Question 7Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CLP holder wants to practice driving a Class A combination vehicle. Who must accompany the permit holder in the front seat?

  1. A State trooper assigned to the training detail
  2. A CDL holder who holds the class and endorsements for the vehicle being driven Correct answer.
  3. Any licensed driver at least 18 years old
  4. A company dispatcher who has completed a safety course

Explanation

A CLP holder may drive only while accompanied by a person who holds a valid CDL of the same class and endorsements for the vehicle. The supervising driver must be in the front seat and able to take control. This ensures the trainer is qualified for the specific vehicle type.

Question 8Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which test must an applicant pass to receive a CDL, in addition to the knowledge tests?

  1. A vision-only screening at the licensing counter
  2. A physical fitness test administered by the employer
  3. A written exam on State tax filing for trucking companies
  4. A skills test covering vehicle inspection, basic control, and on-road driving Correct answer.

Explanation

The CDL skills test has three parts: the pre-trip vehicle inspection, basic vehicle control, and on-road driving. Knowledge tests alone do not qualify an applicant for a CDL. The skills test must be passed in the class of vehicle the applicant will drive.

Question 9Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant holds a CLP and has passed the CDL knowledge tests. What must the applicant do before the State issues the CDL?

  1. Obtain a commercial license from a foreign country
  2. Complete a second CLP application in a neighboring State
  3. Pass the skills test for the vehicle class and provide the required certifications Correct answer.
  4. Submit a letter from a competing carrier

Explanation

After the knowledge tests and the CLP holding period, the applicant must pass the skills test in the appropriate vehicle class. The applicant also provides required certifications, such as medical and residency documentation. Only then does the State issue the CDL.

Question 10Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which document is normally required to prove identity and lawful status when applying for a CDL?

  1. A vehicle registration for a personal car
  2. A utility bill in the applicant's name
  3. A letter of recommendation from a driving school
  4. A birth certificate or other document showing identity and lawful status Correct answer.

Explanation

CDL applicants must present documents proving identity, lawful status, and State residency. A birth certificate or other approved identity document is typically required. Utility bills may show residency but do not prove identity or lawful status alone.

Question 11Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant for a CDL holds a valid driver's license issued by another State. What must the applicant do with that license when applying in the new home State?

  1. Present it only if the skills test is failed
  2. Surrender it to the new State as part of the application Correct answer.
  3. Transfer it to a family member
  4. Keep it in a safe place at home for backup

Explanation

The one-State license rule requires the applicant to surrender any driver's license issued by another State when applying for a CDL in the new home State. The new State then becomes the sole licensing authority. Keeping the old license would violate the rule.

Question 12Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What does a CDL holder need to add before driving a vehicle that requires a hazardous materials endorsement?

  1. A tank vehicle endorsement only
  2. A passenger endorsement
  3. A hazardous materials endorsement plus a Transportation Security Administration security threat assessment Correct answer.
  4. A school bus endorsement

Explanation

Hazardous materials operation requires the H endorsement and a TSA security threat assessment. The driver must also be at least 21 for interstate hazardous materials hauling. Other endorsements do not substitute for the H endorsement.

Question 13Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver's CDL from State A is suspended for a traffic violation. The driver moves to State B and applies for a CDL there. What is the result?

  1. State B may issue a CDL because the suspension was in another State
  2. State B must issue a probationary CDL immediately
  3. State B must deny the application because the driver's privilege is suspended in State A Correct answer.
  4. State B may issue a CDL if the driver pays a fee

Explanation

The one-State license rule is supported by the Driver's License Compact and national records checks. A suspension in one State applies to the driver's privilege to operate a commercial motor vehicle, so another State cannot issue a CDL to a driver whose privilege is suspended. The driver must resolve the suspension first.

Question 14Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which statement best describes the one-State license rule for a CDL holder who splits time between two homes in different States?

  1. The driver must hold a CDL from the State where the vehicle is registered
  2. The driver must hold a CDL from the State where the employer operates
  3. The driver must hold a CDL from both States
  4. The driver may choose either State as home and hold a CDL from that State Correct answer.

Explanation

A CDL holder may hold only one CDL, issued by the State of domicile. When a person has residences in more than one State, the driver selects the domicile State and obtains the CDL there. The vehicle registration State and employer location do not control.

Question 15Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What is the purpose of the commercial learner's permit?

  1. To allow a driver to operate a commercial vehicle alone without a CDL
  2. To replace a CDL during a medical leave
  3. To permit operation of a personal vehicle after license suspension
  4. To allow a new driver to practice driving a commercial motor vehicle while supervised before earning a CDL Correct answer.

Explanation

A CLP lets a new commercial driver practice under the supervision of a qualified CDL holder. It is not a substitute for a CDL and does not allow solo operation. The permit is valid for a limited period while the driver prepares for the skills test.

Question 16Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant for a CDL has a valid medical examiner's certificate. What must the applicant do to keep the CDL valid if the medical certification expires?

  1. Apply for a new CLP and retake the skills test
  2. Surrender the CDL permanently
  3. Nothing, because the CDL remains valid regardless of medical status
  4. Provide updated medical certification to the licensing State as required Correct answer.

Explanation

CDL holders must maintain valid medical certification and provide updated documentation to the licensing State. If the certification expires and is not updated, the State may downgrade or invalidate the CDL. A new CLP and skills test are not required for a routine medical update.

Question 17Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver with a Class A CDL wants to add a passenger endorsement to drive a bus. What must the driver do?

  1. Complete a first-aid course only
  2. Pass the passenger endorsement knowledge test and the skills test in the passenger vehicle Correct answer.
  3. Pass only the general knowledge test again
  4. Apply for a separate CDL from another State

Explanation

Adding a passenger endorsement requires passing the passenger endorsement knowledge test and a skills test in a passenger vehicle. The driver must also meet the medical and age requirements. A separate CDL from another State is not permitted.

Question 18Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which federal requirement applies to a CDL holder who moves to a new State and wants to keep commercial driving privileges?

  1. The driver must obtain a CDL from the new home State within the State's residency period Correct answer.
  2. The driver must notify the old State only after a violation
  3. The driver may keep the old CDL until it expires and then renew it by mail
  4. The driver must retake the general knowledge test in every State

Explanation

When domicile changes, the driver must transfer the CDL to the new home State within the residency period that State allows. The old CDL is surrendered. Renewing an out-of-State CDL by mail is not permitted for a driver who has established a new domicile.

Question 19Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What is the minimum period a CLP must be held before the skills test under federal rules?

  1. 14 days Correct answer.
  2. 3 days
  3. 10 days
  4. 21 days

Explanation

The federal minimum is 14 days from issuance of the CLP to the skills test. States may require a longer period. The holding period supports supervised practice before testing.

Question 20Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL applicant has a valid CLP and wants to practice with a friend who holds a Class B CDL but no air brake endorsement. The practice vehicle has air brakes. What is the result?

  1. The practice is permitted if the friend is over 25
  2. The practice is permitted because the friend holds any CDL
  3. The practice is not permitted because the supervising driver lacks the air brake endorsement for that vehicle Correct answer.
  4. The practice is permitted only on private property

Explanation

The supervising driver must hold a CDL of the same class and the endorsements required for the vehicle being driven. A Class B CDL without the air brake restriction removed does not qualify the friend to supervise practice in an air-braked vehicle. The permit holder must wait for a properly qualified supervisor.

Question 21Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which action is required when a CDL holder's name changes due to marriage?

  1. Keep the old CDL and carry a marriage certificate
  2. Notify the licensing State and obtain a corrected CDL Correct answer.
  3. Apply for a CDL in a different State
  4. Wait until the CDL expires and renew with the new name

Explanation

A CDL holder must notify the licensing State of a name change and obtain a corrected license. The CDL must reflect current identifying information. Waiting for renewal or carrying a marriage certificate is not sufficient.

Question 22Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a CDL with a tank vehicle endorsement. Which vehicle may the driver operate without any additional endorsement?

  1. A tank vehicle carrying non-hazardous liquid cargo Correct answer.
  2. A tank vehicle carrying gasoline in interstate commerce
  3. A school bus carrying students
  4. A vehicle carrying hazardous waste requiring placards

Explanation

The tank vehicle endorsement authorizes operation of tank vehicles. Hauling hazardous materials such as gasoline or placarded hazardous waste also requires the hazardous materials endorsement and a TSA security threat assessment. A school bus requires the passenger and school bus endorsements.

Question 23Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What must an applicant do if the applicant's driving privilege is suspended in another State at the time of applying for a CDL?

  1. Resolve the suspension before the CDL can be issued Correct answer.
  2. Take only the skills test and skip the knowledge tests
  3. Apply in a third State to avoid the suspension
  4. Ask the employer to override the suspension

Explanation

A State cannot issue a CDL to a driver whose driving privilege is suspended in any State. The applicant must clear the suspension first. Applying elsewhere or skipping tests does not avoid the national records check.

Question 24Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which statement about the CDL knowledge tests is correct?

  1. An applicant needs only the air brake knowledge test for any vehicle
  2. An applicant may take the knowledge tests only after receiving the CDL
  3. An applicant must pass the general knowledge test and any endorsement tests for the vehicle to be driven Correct answer.
  4. An applicant may skip the general knowledge test if the skills test is passed

Explanation

CDL applicants must pass the general knowledge test plus the specific knowledge tests for each endorsement sought. Knowledge tests come before the skills test. No endorsement test alone replaces the general knowledge requirement.

Question 25Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a CDL from State A and accepts a job in State B but keeps a permanent home in State A. Where should the CDL be issued?

  1. Either State, at the driver's convenience
  2. State B, because the job is there
  3. State A, because that is the driver's State of domicile Correct answer.
  4. The State where the truck is registered

Explanation

The CDL is issued by the State of domicile, which is the fixed permanent residence the driver intends to return to. A job in another State does not change domicile. The driver keeps the State A CDL while commuting or working temporarily in State B.

Question 26Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Under the federal CDL framework, which government issues a commercial driver's license to a driver?

  1. The employer's home State
  2. The U.S. Department of Transportation
  3. The home State where the driver is domiciled Correct answer.
  4. The State where the driver works most often

Explanation

CDLs are issued by the States, which adopt and enforce federal minimum standards. A driver obtains the CDL from the State of domicile, meaning the State that is the driver's true, fixed, and permanent home. Federal agencies set the standards but do not issue licenses.

Question 27Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver who holds a CDL may hold a commercial driver's license from how many States at one time?

  1. Two, if the driver owns homes in both
  2. One per employer
  3. One Correct answer.
  4. As many as the driver's jobs require

Explanation

The one-State rule means a CDL holder may be licensed commercially by only one State at a time. Holding a second CDL from another State is prohibited, and States must check the national driver record before issuing. This prevents a driver from hiding a suspension in one State by licensing in another.

Question 28Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What is the minimum age at which a person may obtain a commercial driver's license to operate in interstate commerce?

  1. 18
  2. 25
  3. 21 Correct answer.
  4. 19

Explanation

Federal rules require a driver to be at least 21 to drive a commercial motor vehicle in interstate commerce. Drivers aged 18 through 20 may hold a CDL but are limited to intrastate operations unless a specific exception applies. The age floor is a federal minimum that States must enforce.

Question 29Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which requirement applies to a CDL applicant who is subject to the federal physical qualification rules?

  1. Show proof of commercial insurance
  2. Provide a letter from the employer
  3. Pass a vision test only
  4. Submit a current medical examiner's certificate Correct answer.

Explanation

Applicants subject to the physical qualification rules must provide a medical examiner's certificate showing they meet the federal medical standards. The certifying examiner must be listed on the National Registry. The State records the certification status, and the driver must keep it current to remain qualified.

Question 30Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which offense permanently disqualifies a CDL holder from operating a commercial motor vehicle?

  1. A first conviction for failing to wear a seat belt
  2. A first conviction for a lane change without signaling
  3. Using a commercial vehicle to commit a felony involving controlled substances Correct answer.
  4. A first conviction for driving 15 mph over the limit

Explanation

A conviction for using a commercial motor vehicle in the commission of a felony involving controlled substances results in lifetime disqualification, with no reinstatement available. Other major offenses carry long but finite disqualification periods. Routine traffic violations carry shorter penalties.

Question 31Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder is convicted of driving a commercial motor vehicle with a blood alcohol concentration of 0.04 percent. What is the consequence?

  1. A warning with no record entry
  2. A fine with no license action
  3. Disqualification from operating a commercial motor vehicle Correct answer.
  4. Loss of the hazardous materials endorsement only

Explanation

The federal alcohol threshold for commercial drivers is 0.04 percent, lower than the limit for noncommercial drivers. A conviction at or above that level disqualifies the driver from operating a commercial motor vehicle. The disqualification is recorded on the driver's record and reported through the national clearinghouse systems.

Question 32Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

What does a State issue to a person who has completed the CDL knowledge tests but has not yet passed the skills test?

  1. A commercial learner's permit Correct answer.
  2. A full CDL with a probationary label
  3. An interim chauffeur's license
  4. A restricted noncommercial license

Explanation

After passing the required knowledge tests, an applicant receives a commercial learner's permit. The CLP allows the holder to practice driving a commercial motor vehicle while accompanied by a qualified driver. The CDL itself is issued only after the skills test is passed.

Question 33Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which document must a CDL applicant present to show that the applicant's presence in the United States is authorized?

  1. A proof of lawful status document acceptable to the State Correct answer.
  2. A vehicle registration card
  3. A union membership card
  4. A commercial insurance certificate

Explanation

Federal rules require CDL applicants to provide proof of identity and proof of lawful status in the United States. States verify the document through the federal immigration status verification system. Vehicle documents and employment cards do not establish lawful status.

Question 34Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a CDL with a passenger endorsement. Which additional requirement applies before the driver may transport passengers for a school district?

  1. A hazardous materials endorsement
  2. A doubles/triples endorsement
  3. A tank vehicle endorsement
  4. A school bus endorsement and compliance with State school bus requirements Correct answer.

Explanation

Driving a school bus requires a school bus endorsement in addition to the passenger endorsement. The driver must also meet State-specific requirements such as background checks and training. The other endorsements cover different vehicle types entirely.

Question 35Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver's CDL is disqualified for 60 days after a second serious traffic violation within three years. What must the driver do before resuming commercial driving?

  1. Serve the disqualification period and obtain reinstatement from the licensing State Correct answer.
  2. Retake only the air brake knowledge test
  3. Submit a new employment application
  4. Apply for a CDL in a neighboring State

Explanation

A disqualification must be served in full, and the driver must satisfy the licensing State's reinstatement requirements before commercial driving resumes. The disqualification applies nationwide through the one-State rule. Licensing in another State does not shorten or avoid the period.

Question 36Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder wants to add a hazardous materials endorsement. What must the holder do before the endorsement is issued?

  1. Complete a security threat assessment and be cleared by TSA Correct answer.
  2. Pass a defensive driving course
  3. Provide a letter from a shipper
  4. Obtain a tank vehicle endorsement first

Explanation

The hazardous materials endorsement requires a Transportation Security Administration security threat assessment. The driver must submit fingerprints and be determined not to pose a security threat. The knowledge test for the endorsement is also required, but the security clearance is the distinctive step.

Question 37Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder's driving privilege is suspended in one State. What happens to the driver's ability to operate a commercial motor vehicle in other States?

  1. Commercial driving remains legal in States that did not suspend the driver
  2. The driver may drive if an employer vouches for the record
  3. The disqualification applies nationwide through the national driver record systems Correct answer.
  4. Only the suspending State's roads are off limits

Explanation

Disqualifications and suspensions are reported to national driver record systems and apply to commercial operation everywhere. A driver cannot escape a suspension by crossing a State line. Employers must also query the drug and alcohol clearinghouse and driving record before allowing driving.

Question 38Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a Class B CDL and wants to drive a Class A combination vehicle. What must the driver do?

  1. Complete a 40-hour training course only
  2. Pass the Class A knowledge and skills tests and obtain a Class A CDL Correct answer.
  3. Add a doubles/triples endorsement only
  4. Obtain a Class A learner's permit only

Explanation

The class of CDL determines which vehicle groups a driver may operate. Moving from Class B to Class A requires meeting the Class A testing requirements, including the knowledge and skills tests. An endorsement or a training course alone does not upgrade the license class.

Question 39Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which statement about the CDL general knowledge test is accurate?

  1. It may be replaced by an employer's written certification
  2. It is waived for drivers with 20 years of experience
  3. It is required only for hazardous materials drivers
  4. It must be passed before a commercial learner's permit is issued Correct answer.

Explanation

The general knowledge test is the foundation of the CDL knowledge testing sequence and must be passed before a CLP is issued. Additional knowledge tests are required for each endorsement and for certain vehicle classes. Experience and employer statements do not substitute for the test.

Question 40Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder is convicted of a first offense of driving a commercial motor vehicle while under the influence of a controlled substance. What is the minimum disqualification period?

  1. 30 days
  2. Six months
  3. One year Correct answer.
  4. Five years

Explanation

A first conviction for a major offense such as driving a commercial motor vehicle under the influence of alcohol or a controlled substance results in a one-year disqualification. A second major offense results in a lifetime disqualification. The period applies to commercial operation nationwide.

Question 41Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant for a CDL has a valid commercial learner's permit and wants to take the skills test. Which condition must be met first?

  1. The applicant must own the test vehicle
  2. The applicant must have a job offer from a motor carrier
  3. The permit must have been held for the required minimum period Correct answer.
  4. The applicant must have completed a hazmat assessment

Explanation

Federal rules require a CLP to be held for a minimum period before the skills test may be taken. The permit holder must also have passed the required knowledge tests and be accompanied by a qualified driver when practicing. A job offer or vehicle ownership is not a testing prerequisite.

Question 42Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver moves to a new State and establishes domicile there. What must the driver do with the CDL from the former State?

  1. Surrender it when applying for a CDL in the new State Correct answer.
  2. Mail it to the former employer
  3. Retain it until it expires and then renew in the old State
  4. Keep it and use it alongside a new license

Explanation

Because only one State may issue a CDL, the driver must surrender the former State's license when obtaining a new one. The new State verifies the driving record through the national systems before issuing. Keeping two CDLs violates the one-State rule.

Question 43Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder's medical examiner's certificate expires while the holder is driving commercially. What is the result?

  1. The CDL is automatically revoked for one year
  2. The driver becomes unqualified to operate a commercial motor vehicle Correct answer.
  3. The driver may continue if the employer grants an extension
  4. The driver may continue until the next license renewal

Explanation

A CDL holder subject to the physical qualification rules must maintain a current medical examiner's certificate. When the certificate expires, the driver is no longer medically qualified to operate a commercial motor vehicle. The employer cannot extend the certificate, and the driver must obtain a new examination.

Question 44Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

Which document does a State typically require an applicant to present as proof of State domicile when applying for a CDL?

  1. A utility bill or lease showing the applicant's residence address Correct answer.
  2. A birth certificate
  3. A passport
  4. A Social Security card

Explanation

States require proof of domicile, often shown through a lease, utility bill, or similar document bearing the applicant's residence address. Identity and lawful status are proven separately through other documents. A passport or birth certificate proves identity or citizenship, not residence.

Question 45Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a CDL with a doubles/triples endorsement and wants to tow two trailers. Which factor determines whether the driver may do so?

  1. The driver must hold a passenger endorsement
  2. The driver must first obtain a tank vehicle endorsement
  3. The driver must be at least 25 years old
  4. The combined weight and configuration must fall within the class and endorsement held Correct answer.

Explanation

The license class and the doubles/triples endorsement together define the vehicles a driver may operate. The combination must match the class and endorsement on the license. Other endorsements and age above the federal minimum do not control this authorization.

Question 46Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver with a valid CDL in State A is convicted of a serious traffic violation in State B. What is the effect on the driver's CDL?

  1. State B must revoke the driver's State A CDL directly
  2. The conviction is ignored because it occurred out of State
  3. The driver may choose which State records the conviction
  4. State A must record the conviction and apply any disqualification Correct answer.

Explanation

States report convictions to the licensing State through the national driver record systems, and the licensing State applies the disqualification. The one-State rule ensures a single licensing authority tracks the driver's record. A driver cannot choose where a conviction is recorded.

Question 47Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

An applicant has a valid CLP and wants to practice driving a commercial motor vehicle. Which accompanying person satisfies the federal requirement?

  1. A CDL holder riding in a trailing vehicle
  2. A person holding a valid CDL of the same class and endorsements, sitting in the front seat Correct answer.
  3. A noncommercial driver with ten years of experience
  4. A driving instructor without a CDL

Explanation

A CLP holder must be accompanied by a person who holds a valid CDL of the same class and endorsements for the vehicle being driven. That person must occupy the front seat and be able to take control. Experience alone or a non-CDL instructor does not meet the rule.

Question 48Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver holds a CDL from State A and moves to State B, where the driver now lives permanently. The State A license remains unexpired. Which statement is correct?

  1. The driver must wait one year before applying in State B
  2. The driver may keep the State A CDL until it expires while working in State B
  3. The driver may hold both licenses because both are valid
  4. The driver must obtain a State B CDL within the State's required period and surrender the State A license Correct answer.

Explanation

A CDL holder who changes domicile must apply for a CDL in the new home State within the period that State requires and surrender the prior license. The one-State rule prohibits holding two CDLs. The unexpired status of the old license does not extend the driver's right to keep it.

Question 49Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A driver's CDL is disqualified for one year after a first major offense. Which action would allow the driver to resume commercial driving sooner?

  1. Transferring the CDL to another State
  2. None; the disqualification must be served in full before reinstatement Correct answer.
  3. Completing a remedial driving course
  4. Paying an administrative fee

Explanation

Federal disqualification periods are minimums that must be served before the licensing State may reinstate commercial privileges. Courses, fees, and transfers do not shorten the period. The driver may only resume commercial driving after the period ends and the State reinstates the license.

Question 50Licensing and CDL Requirements (obtaining a CDL through the home State; one-State license rule)

A CDL holder wants to add a tank vehicle endorsement to haul liquid cargo. Besides the endorsement knowledge test, which additional test is required for vehicles with cargo tanks?

  1. A passenger skills test
  2. A school bus skills test
  3. A tank vehicle skills test in a vehicle with a cargo tank Correct answer.
  4. A doubles/triples skills test

Explanation

Adding a tank vehicle endorsement requires passing the tank vehicle knowledge test and a skills test performed in a vehicle with a cargo tank. The skills test confirms the driver can handle the vehicle's high center of gravity and liquid surge. Other endorsement skills tests cover different vehicle types.