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Alabama driving lesson · Adjust to Driving Conditions

Skids and hydroplaning

A 3-minute lesson from the Alabama course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Adjust to Driving Conditions
Checkpoint questions
6
Source pages
73, 74

When your tires lose their grip, the engine can't pull, the brakes don't work well and steering feels dead. Knowing what to do and what not to do helps you recover.

Skid

When a vehicle's tires lose their grip on the roadway. The engine loses its pulling effect and the brakes and steering seem ineffective.

Handbook p. 73 ↗

Know the rule

Don't brake during a skid. Braking increases the skid and, if the front wheels lock, you lose steering control. Once you've regained control of your direction, brake carefully if needed.

Handbook p. 73 ↗

Know the rule

The main idea in any skid is to keep the rear end from outrunning the front: either slow the rear wheels or speed up the front wheels.

Handbook p. 73 ↗

Correcting a skid

Correcting a skid
VehicleWhat to do
Rear-wheel driveEase off the gas so the engine slows the rear wheels; steer
Front-wheel driveStep lightly on the gas to speed up the front wheels
No room to accelerateClutch in or shift to neutral; steer where the rear skids
Handbook p. 74 ↗

Know the rule

Many safety experts hesitate to recommend shifting into neutral, because a panicked driver may look away from the road or shift past neutral into reverse.

Handbook p. 74 ↗

Hydroplaning

"Water skiing on the highway": tires stop wiping the wet road and ride up on a film of water, losing friction to brake, accelerate or corner.

Handbook p. 74 ↗

Hydroplaning in a standard passenger car

Hydroplaning in a standard passenger car
SpeedWhat happens
Up to 35 mphMost tires wipe the road surface
About 35 mphPartial hydroplaning starts
About 55 mphTires may be totally on the water
Above 50 mph, water deeper than treadComplete hydroplaning can be expected
Handbook p. 74 ↗

Know the rule

If you hydroplane, take your foot off the accelerator and let the car slow. Partially hydroplaning, you can usually correct the skid; totally hydroplaning, release the gas and ride it out.

Handbook p. 74 ↗

Know the rule

Good tires with deep treads help prevent hydroplaning by letting water escape from under the tires.

Handbook p. 74 ↗

Put it into practice

Driving 60 mph in a heavy rainstorm, your steering suddenly feels light. You may be hydroplaning. Don't brake or jerk the wheel. Take your foot off the gas and let the car slow down until the tires grip again.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

In a rear-wheel-drive vehicle, what should you do to correct a skid?
  1. Brake hard immediately
  2. Accelerate to regain traction
  3. Ease off the gas so the engine slows the rear wheels
  4. Shift into reverse

Answer: Ease off the gas so the engine slows the rear wheels

Easing off the gas in a rear-wheel-drive vehicle lets the engine act as a brake, slowing the rear wheels and helping correct the skid.

Handbook p. 73 ↗
In a front-wheel-drive vehicle, what technique helps correct a skid?
  1. Shifting immediately to reverse
  2. Slamming on the brakes
  3. Pulling the parking brake
  4. Stepping lightly on the gas to increase front wheel speed

Answer: Stepping lightly on the gas to increase front wheel speed

For front-wheel drive, light acceleration increases front wheel speed, helping the front catch up with the sliding rear.

Handbook p. 74 ↗
Why shouldn't you brake as soon as a skid begins?
  1. It speeds up the skid and can cost you steering
  2. It will stall the engine
  3. It overheats the brakes
  4. It is illegal to brake while skidding

Answer: It speeds up the skid and can cost you steering

The handbook warns that braking during a skid can increase the skid's speed and cause loss of steering when the front wheels lock.

Handbook p. 73 ↗
At what speed does partial hydroplaning typically begin for a standard passenger car?
  1. About 25 mph
  2. About 35 mph
  3. About 55 mph
  4. About 15 mph

Answer: About 35 mph

Partial hydroplaning in a standard passenger car begins at about 35 mph and increases with speed.

Handbook p. 74 ↗
In a severe rainstorm, at what speed can a car's tires lose all contact with the road (total hydroplaning)?
  1. About 15 mph
  2. About 75 mph
  3. About 55 mph
  4. About 25 mph

Answer: About 55 mph

In a severe rainstorm, tires may lose all contact with the road at 55 mph, resulting in total hydroplaning.

Handbook p. 74 ↗
What is the best immediate response if you start to hydroplane?
  1. Brake hard immediately
  2. Turn the wheel sharply to one side
  3. Accelerate to punch through the water
  4. Take your foot off the accelerator and let the car slow down

Answer: Take your foot off the accelerator and let the car slow down

The best response to hydroplaning is releasing the accelerator and letting the car slow down.

Handbook p. 74 ↗
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