Alabama CDL — General Knowledge: Speed & Space Management Practice Test

Question 1

If your vehicle begins to hydroplane, you should:

Accepted Answer

Release the accelerator and let the vehicle slow down — During hydroplaning, ease off the accelerator (and push in the clutch if needed) rather than braking, which can cause a skid.

Answer

Accelerate to push through the water

Answer

Brake firmly to regain grip

Answer

Turn the wheel sharply toward the shoulder

Question 2

Of all the space around your vehicle, the most important space to manage is:

Accepted Answer

The space ahead of you — You need room in front more than anywhere else because that is the space you can use to avoid what happens ahead.

Answer

The space beneath the vehicle

Answer

The space directly behind you

Answer

The space overhead

Question 3

When a heavy load slows you going uphill and others tailgate, the best move is to:

Accepted Answer

Stay in the right lane where you can — If a heavy load holds you back on a grade, keeping to the right lets faster traffic get around you safely.

Answer

Speed up beyond a safe pace

Answer

Brake to force them back

Answer

Move into the left lane to pass

Question 4

If you double your speed, what happens to your braking distance?

Accepted Answer

It becomes about four times longer — Going from 20 to 40 mph makes both the impact and the braking distance roughly four times greater.

Answer

It becomes about twice as long

Answer

It becomes about eight times longer

Answer

It stays about the same

Question 5

Hydroplaning can begin at speeds as low as:

Accepted Answer

30 mph when a lot of water is present — With enough standing water, tires can lose contact and hydroplane at speeds as low as 30 mph, especially with low pressure or worn tread.

Answer

10 mph in light rain

Answer

70 mph only

Answer

55 mph on any wet road

Question 6

In a roadway work zone, the number one cause of injuries and deaths is:

Accepted Answer

Speeding traffic — Speeding is the leading killer in work zones, so obey the posted limits and slow further when workers are near the road.

Answer

Loose gravel

Answer

Poor lighting

Answer

Falling equipment

Question 7

Total stopping distance is made up of which three parts?

Accepted Answer

Perception distance, reaction distance, and braking distance — The distance to stop is the sum of how far you travel while perceiving the hazard, reacting to it, and then braking.

Answer

Warning distance, coasting distance, and skid distance

Answer

Following distance, braking distance, and swerve distance

Answer

Sight distance, gap distance, and stopping distance

Question 8

Reaction distance refers to how far the vehicle travels:

Accepted Answer

After your brain recognizes the hazard but before you push the brake — Reaction distance is the ground covered while you move your foot to the brake - roughly 61 feet at 55 mph for an average driver.

Answer

Before your eyes notice the hazard

Answer

During a complete skid

Answer

While the brakes are slowing the vehicle

Question 9

As you drive through a long construction zone, you should watch the speedometer because:

Accepted Answer

Your speed can creep up without you noticing — Speed tends to drift upward over a long work zone, so checking the speedometer keeps you at the posted limit.

Answer

Cruise control is required there

Answer

The odometer may stop working

Answer

Fuel use drops in work zones

Question 10

On a slippery road, the space you need to stop:

Accepted Answer

Increases well beyond what dry pavement requires — Reduced traction on wet or icy roads means you must allow much more following and stopping space than on dry pavement.

Answer

Decreases because tires grip harder

Answer

Only matters above 60 mph

Answer

Stays the same as on dry pavement

Question 11

Why does a vehicle's speed tend to increase on a downgrade?

Accepted Answer

Gravity pulls the vehicle downhill — On a long downgrade, gravity works to accelerate the vehicle, so drivers must choose a safe speed and low gear ahead of time.

Answer

Air pressure builds in the tires

Answer

The brakes release on their own

Answer

The engine automatically speeds up

Question 12

Why should you be concerned about the space overhead?

Accepted Answer

Hitting overhead objects like bridges or wires can damage the vehicle — Low bridges, signs, and wires can be struck by a tall vehicle, so knowing your height and watching overhead clearance matters.

Answer

It has no real safety effect

Answer

It changes your following distance

Answer

It affects your fuel economy

Speed & Space Management

Study questions with answers

1. If your vehicle begins to hydroplane, you should:

2. Of all the space around your vehicle, the most important space to manage is:

3. When a heavy load slows you going uphill and others tailgate, the best move is to:

4. If you double your speed, what happens to your braking distance?

5. Hydroplaning can begin at speeds as low as:

6. In a roadway work zone, the number one cause of injuries and deaths is:

7. Total stopping distance is made up of which three parts?

8. Reaction distance refers to how far the vehicle travels:

9. As you drive through a long construction zone, you should watch the speedometer because:

10. On a slippery road, the space you need to stop:

11. Why does a vehicle's speed tend to increase on a downgrade?

12. Why should you be concerned about the space overhead?

More CDL — General Knowledge topics

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