Commercial Driver's License Flashcards
7 cards from real PENNDOT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Commercial Driver's License flashcards as text
According to federal regulations, how long must a CDL driver keep a paper logbook (record of duty status) on hand?
Answer: 7 days plus current day
Drivers using paper logs must retain the current day's log and the previous 7 days' logs in the vehicle, available for inspection.
A Pennsylvania CDL holder who refuses a lawful request for a drug or alcohol test while operating a CMV will face:
Answer: The same consequences as a confirmed positive test result
Refusing a lawful drug or alcohol test is treated the same as a positive test result, leading to disqualification and return-to-duty requirements.
What is the safe following distance rule for a CMV traveling at highway speeds in ideal conditions?
Answer: One second of following distance for every 10 feet of vehicle length
The rule is one second of following distance for every 10 feet of vehicle length, plus one extra second above 40 mph.
Which of the following hazardous materials classes is prohibited from being carried through tunnels in Pennsylvania without special authorization?
Answer: Division 1.1 Explosives (mass explosion hazard)
Division 1.1 explosives, which pose a mass explosion hazard, require special routing and are generally prohibited through tunnels.
When descending a long steep grade, what is the safest braking technique for a CMV with air brakes?
Answer: Snub braking — apply firm pressure to reduce speed, then release completely, then repeat
Snub braking (apply firmly to slow the vehicle, then release and allow brakes to cool, then repeat) prevents brake fade from overheating.
Under Pennsylvania CDL law, if a CDL holder's license is suspended in another state, what happens to their Pennsylvania CDL?
Answer: The Pennsylvania CDL is also suspended for the same period
Pennsylvania must honor out-of-state suspensions and will apply a corresponding suspension to the Pennsylvania CDL under the Driver License Compact.
What is the purpose of the 'air supply' valve (also called the tractor protection valve) on a combination vehicle?
Answer: It protects the tractor's air supply if the trailer breaks away or develops a major air leak
The tractor protection valve automatically closes to preserve the tractor's air supply if the trailer separates or suffers a catastrophic air line failure.