Correct: Because stopping distance increases by four times when speed doubles, a vehicle stopping in 150 feet at 30 mph will need approximately 600 feet at 60 mph.

Correct: The one thing ABS does prevent is wheel lockup during hard braking — it does not compensate for unsafe driving behaviors or reduce the need for safe following distances.

Correct: Signaling early before a turn is the most important communication action — it gives following drivers the most time to adjust and prevents them from attempting to pass.

Correct: Checking your mirrors regularly can help you spot a tire fire — a rear tire problem may show as smoke in the mirror before the driver feels or hears anything.

Correct: To obtain a CDL you must complete Entry Level Driver Training and pass both knowledge tests and skills tests — both components are required.

Correct: The space ahead is the most important because it is where you are driving — you must have enough room to stop safely no matter what happens in front of you.

Correct: Oil pressure should reach normal range within seconds of starting the engine — a slow or absent pressure rise is a warning sign that requires immediate attention.

Correct: If your personal vehicle driving privileges are suspended for traffic violations, you will also lose your CDL — the two privileges are linked under federal and state law.

Correct: A stale green light should be treated as likely to change — begin slowing down and be prepared to stop rather than assuming it will remain green as you approach.

Correct: All of the listed signs — clear reflections, raindrops on the surface, and tire splashes — can indicate standing water and potential hydroplaning conditions.

Correct: If any detectable amount of alcohol is found in your system while operating a commercial vehicle you will be placed out of service for a minimum of 24 hours.

Correct: All three factors — re-paving, packed snow, and vehicle weight — can reduce available overhead clearance, so posted heights should never be assumed to be current or accurate.

Correct: Signing the daily inspection report certifies that defects have been repaired or determined not to require repair — you must not sign until one of those conditions is met.

Correct: Two serious traffic violations within a three-year period results in at least a 60-day CDL loss — three violations within three years results in a longer suspension.

Correct: When backing a straight truck or bus, turn the top of the steering wheel toward the direction you want to go — this is the same intuitive direction as backing a car.

Correct: A steady rain is the exception — while it starts slippery, continuous rain eventually washes the road clean, whereas black ice, melting ice, and fresh rain are all hazardous.

Correct: If the ABS warning lamp comes on while driving, continue driving normally — your regular brakes still work, but you should have the ABS system checked soon.

Correct: Refusing an alcohol test results in a 12-month CDL disqualification — by operating a CMV in Pennsylvania you have already given consent to testing.

Correct: At 45 mph on dry pavement braking distance for a heavy vehicle is approximately 400 feet, which is why maintaining adequate following distance is essential.

Correct: Slow to a safe speed before entering the curve, then accelerate slightly as you come through — this maintains traction and keeps the vehicle stable.