CDL Class A Exam Questions & Answers 2026 (21–30)

Question 1

When double-clutching an upshift in a 10-speed transmission under a heavy load at highway speed, the driver releases the accelerator and moves to neutral. Before completing the shift into the next higher gear, engine RPM should be:

TheoryPractice · Accepted Answer

Lower than it was in the previous gear, because a higher gear turns more slowly at the same road speed. During an upshift, the driver must allow RPM to drop in neutral so that the engine speed matches the slower input-shaft speed required by the higher gear at the current road speed; engaging with too-high RPM causes a harsh clunk and driveline shock.

Question 2

How far ahead should a commercial driver look when driving at highway speeds?

TheoryPractice · Accepted Answer

12 to 15 seconds ahead. The CDL manual instructs drivers to look 12 to 15 seconds ahead at highway speeds to identify hazards early enough to respond safely.

Question 3

When driving in city traffic at lower speeds, how far ahead should a commercial driver scan?

TheoryPractice · Accepted Answer

One full city block ahead. At city speeds the CDL manual recommends scanning at least one city block ahead, which equates to roughly 12 seconds of travel time and provides adequate hazard recognition distance.

Question 4

When is it appropriate to use your horn while operating a commercial motor vehicle?

TheoryPractice · Accepted Answer

To warn others of your presence when necessary to help avoid a collision. The CDL manual identifies the horn as a safety device to be used when needed to warn others and help prevent a collision, not as a routine courtesy signal.

Question 5

Which side of a tractor-trailer has the largest blind spot?

TheoryPractice · Accepted Answer

The passenger's right side, extending diagonally toward the rear of the trailer. The CDL manual identifies the right-side blind spot as the largest danger zone because it extends diagonally from the cab past the entire length of the trailer, making vehicles alongside the right side invisible to the driver.

Question 6

When preparing to change lanes on a multi-lane highway, after signaling a driver should do what before moving?

TheoryPractice · Accepted Answer

Confirm it is safe and allow surrounding drivers enough time to react to the signal. The CDL manual emphasizes that a turn signal communicates intent; the driver must verify the move is safe and give other drivers adequate time to respond before executing the lane change.

Question 7

You are stopped at a red light that turns green. What should you do before moving the vehicle?

TheoryPractice · Accepted Answer

Check all mirrors and scan the intersection for any crossing traffic or pedestrians. The CDL manual instructs drivers to re-check mirrors and scan the intersection before proceeding on a green light because other vehicles may have run the red or pedestrians may be in the crosswalk.

Question 8

What is the CDL manual's baseline following-distance rule for a vehicle over 40 feet long traveling at speeds above 40 mph?

TheoryPractice · Accepted Answer

One second of following distance for every 10 feet of vehicle length, plus one additional second. The CDL manual requires one second per 10 feet of vehicle length as the base following distance, with one additional second added whenever speed exceeds 40 mph.

Question 9

When backing a tractor-trailer, which mirrors are most useful for monitoring the path directly behind the trailer on both sides?

TheoryPractice · Accepted Answer

The flat primary (plane) mirrors on both sides of the cab. The CDL manual directs drivers to use both flat primary mirrors while backing so they can track the trailer's movement and verify clearance along each side.

Question 10

A driver is operating a 70-foot combination vehicle at 55 mph. Using the CDL manual's following-distance formula, what is the correct minimum following distance?

TheoryPractice · Accepted Answer

8 seconds. The CDL manual requires one second per 10 feet of vehicle length (70 feet = 7 seconds) plus one additional second for speeds above 40 mph, giving a minimum of 8 seconds total.

CDL Class A Exam Questions & Answers 2026 (21–30)

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