CDL Practice Tests: Driving Safely

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Question #184 (1 of 10)

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Which of the following is true about drug use for commercial drivers?

  • You are allowed to use any legal medications, but no illegal drugs
  • They prohibit being under the influence of any “controlled substance,” narcotics, or any other substance, which can make the driver unsafe. This could include a variety of prescription and over-the-counter drugs (cold medicines), which may make the driver drowsy or otherwise affect safe driving ability.
  • They prohibit being under the influence of any “controlled substance,” narcotics, or any other substance, which can make the driver unsafe. This does not apply to any over-the-counter medications or prescriptions.
  • Drugs of any kind, prescription or illegal, are strictly prohibited for commercial driving
Laws prohibit possession or use of many drugs while on duty. They prohibit being under the influence of any “controlled substance,” amphetamines (including “pep pills,” “uppers” and “bennies”), narcotics, or any other substance, which can make the driver unsafe. This could include a variety of prescription and over-the-counter drugs (cold medicines), which may make the driver drowsy or otherwise affect safe driving ability.
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Question #71 (2 of 10)

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When parked on the side of the road, what should you do immediately, and why?

  • Turn on the four-way emergency flashers to give a warning to other vehicles.
  • Keep your lights off so no one accidentally believes you're moving
  • Contact the local police so they can position themselves behind you
  • Contact dispatch to let them know you're not parked at a customer
When Parked at the Side of the Road. When you pull off the road and stop, be sure to turn on the four-way emergency flashers. This is important at night. Do not trust the taillights to give a warning. Drivers have crashed into the rear of a parked vehicle because they thought it was moving normally.
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Question #55 (3 of 10)

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If you are starting on an incline, you must not roll back when you begin moving. You may hit someone behind you. If you have a manual transmission vehicle, what should you do?

  • Hold the brake firmly, release the clutch completely, then put some power to the wheels. Finally, release the brake.
  • Partly engage the clutch before you take your right foot off the brake.
  • Hold the clutch firmly to the floor while slightly giving it gas, then hold the brake
  • Release the brake completely with the clutch firmly to the floor. Slowly give the engine power, re-apply the brake, then release the clutch completely.
If you have a manual transmission vehicle, partly engage the clutch before you take your right foot off the brake.
If you roll backward when starting on an incline during your road test, it is an automatic failure.
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Question #165 (4 of 10)

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Which of the following are true about ABS?

  • All of these answers are true
  • ABS will not increase or decrease ultimate stopping power. ABS is an “add-on” to your normal brakes, not a replacement for them.
  • ABS will not prevent power or turning skids. ABS should prevent brake-induced skids or jackknifes, but not those caused by spinning the drive wheels or going too fast in a turn.
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • ABS will not allow you to drive faster, follow more closely or drive less carefully.
  • ABS will not prevent power or turning skids. ABS should prevent brake-induced skids or jackknifes, but not those caused by spinning the drive wheels or going too fast in a turn.
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • ABS will not increase or decrease ultimate stopping power. ABS is an “add-on” to your normal brakes, not a replacement for them.
  • ABS will not change the way you normally brake. Under normal brake conditions, your vehicle will stop as it always stopped. ABS only comes into play when a wheel would normally have locked up because of over braking.
  • ABS will not compensate for bad brakes or poor brake maintenance.
  • Remember: The best vehicle safety feature is still a safe driver.
  • Remember: Drive so you never need to use your ABS.
  • Remember: If you need it, ABS could help to prevent a serious crash.
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Question #127 (5 of 10)

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Water in the brakes can cause the brakes to:

  • Overheat from the steam during evaporation
  • Fail completely
  • Be weak, to apply unevenly, or to grab
  • Water has no potential effect on the braking force

Wet Brakes. When driving in heavy rain or deep standing water, your brakes will get wet. Water in the brakes can cause the brakes to be weak, to apply unevenly, or to grab. This can cause a lack of braking power, wheel lockups, pulling to either side, and jackknife if you pull a trailer.

Wet brakes in the winter can be a problem. The water can cause the brakes to freeze after you're parked. Before parking in the winter, drag your brakes a little while going through the parking lot. The heat will evaporate the water.
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Question #38 (6 of 10)

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What will state or Federal inspectors do if they judge the vehicle to be unsafe?

  • They will require you to transfer the load to another truck
  • They will require the driver to take a 30 minute safety course before driving again
  • They will put it "out of service" until it is fixed.
  • They will tow it to the nearest holding lot
Federal and state inspectors also may inspect your vehicle. If they judge the vehicle to be unsafe, they will put it "out of service" until it is fixed.
Being placed "out of service" can happen if inspectors decide the vehicle is unsafe. They can also place a driver out of service if they deem the driver unfit to drive or if the driver can not drive legally.
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Question #82 (7 of 10)

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Define "Perception Distance":

  • The total minimum distance your vehicle has traveled, in ideal conditions, with everything considered, until you can bring your vehicle to a complete stop.
  • The distance your vehicle will travel in ideal conditions, while you are braking.
  • The distance you will continue to travel, in ideal conditions; before you physically hit the brakes in response to a hazard seen ahead.
  • The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it.

Perception Distance. The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it. Keep in mind, certain mental and physical conditions can affect your perception distance. It can be affected greatly depending on visibility and the hazard itself. The average perception time for an alert driver is 1 3/4 seconds. At 55 mph, this accounts for 142 feet traveled.

Memorize this definition. You may see it on the test and you need to understand it.
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Question #119 (8 of 10)

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What should you do if someone is coming at you with their high beams on?

  • Look slightly to the right at a right lane or edge marking
  • Pull off on the side of the road until they pass
  • Blink your lights off and on as a signal to them
  • Tap your high beams to let them know you don't like it

Avoid Glare from Oncoming Vehicles. Do not look directly at lights of oncoming vehicles. Look slightly to the right at a right lane or edge marking, if available. If other drivers have their high beams on do not try to “get back at them” by putting your own high beams on. This increases glare for oncoming drivers and increases the chance of a crash.

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Question #139 (9 of 10)

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Which of the following is true about gear selection when going down a mountain with a heavy load?

  • With modern trucks, it's easy and safe to shift while going downhill. You can "adjust as you go" to the steepness of the mountain and road conditions. Shift up and down freely.
  • Stay in high gear and start down the mountain. Once you get a feel for the steepness of the grade, shift to the proper gear.
  • Start in high gear but downshift as you descend until you're at 25 mph. This is the safest speed for any truck to go down a mountain.
  • Shift the transmission to a low gear before starting down the grade. Do not try to downshift after your speed has already built up.

With older trucks, a rule for choosing gears is to use the same gear going down a hill that you would need to climb the hill. However, new trucks have low friction parts and streamlined shapes for fuel economy. They may also have more powerful engines. This means they can go up hills in higher gears and have less friction and air drag to hold them back going down hills. For that reason, drivers of modern trucks may have to use lower gears going down a hill than would be required to go up the hill. You should know what is right for your vehicle.

When you're in the proper gear going down a mountain, the engine brake will do almost all of the work. You'll hardly tough the foot brake. Keep your speed down!
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Question #146 (10 of 10)

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If an oncoming driver has drifted into your lane, what is the best move?

  • Stay straight. Do not veer out of your lane.
  • A move to your right
  • None of these are the best choice
  • A move to your left
Where to Steer. If an oncoming driver has drifted into your lane, a move to your right is best. If that driver realizes what has happened, the natural response will be to return to his/her own lane. If something is blocking your path, the best direction to steer will depend on the situation.
It's easy to overthink this and steer to your left (toward the oncoming lane) thinking the oncoming vehicle will basically wind up "switching sides" with you and going around you on the wrong side. Rarely will that happen. Most of the time someone drifts into oncoming traffic is because they are distracted. Once they look up again and realize what has happened, they will instinctually jerk the vehicle back into their lane.
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About The Safe Driving CDL Exam

The Safe Driving portion of the CDL manual will be on the General Knowledge portion of the CDL permit written exam. This is a rather large section of the CDL Manual and also includes basic information on hazardous materials (HazMat) that all drivers should know. Here are the basics of what you must know:

  • Vehicle Inspection
  • Basic Control of Your Vehicle
  • Shifting Gears
  • Seeing
  • Communicating
  • Space Management
  • Controlling Your Speed
  • Seeing Hazards
  • Distracted Driving
  • Aggressive Drivers/Road Rage
  • Night Driving
  • Driving in Fog
  • Winter Driving
  • Hot Weather Driving
  • Railroad-highway Crossings
  • Mountain Driving
  • Driving Emergencies
  • Antilock Braking Systems
  • Skid Control and Recovery
  • Accident Procedures
  • Fires
  • Alcohol, Other Drugs and Driving
  • Staying Alert and Fit to Drive
  • Hazardous Materials Rules

Vehicle Inspections

Safety is the most important reason for completing a vehicle inspection. A vehicle defect found during an inspection could prevent problems later, such as a breakdown on the road that will cost time and dollars, or even worse, a crash caused by the defect.

Federal and state laws require that drivers inspect their vehicles. Federal and state inspectors also may inspect your vehicles. If they judge the vehicle to be unsafe, they will put the vehicle "out of service" until it is repaired.

Generally speaking the major things you'll be checking will be:

  • Tire Problems
  • Wheel And Rim Problems
  • Break Drums And Shoes
  • Steering System Defects
  • Suspension System Defects
  • Exhaust System Defects
  • Safety Equipment Present
  • Cargo Properly Loaded And Secured

Pre-Trip Inspection

In order to obtain a CDL, you will be required to pass a pre-trip vehicle inspection test. You will be tested to see if you know whether your vehicle is safe to drive. You will be asked to do a pre-trip inspection of your vehicle and explain to the examiner what you would inspect and why.

The pre-trip inspection is a long, exhaustive inspection and we're not going to cover it all here. But we do have an excellent pre-trip inspection in our forum, done by one of our moderators who is currently a trainer at Prime Inc.

Daniel's Pre-Trip Inspection

Questions You Should Be Able To Answer

Here are some questions you should be able to answer before taking your CDL permit exam:

  • 1. What is the most important reason for doing a vehicle inspection?
  • 2. What things should you check during a trip?
  • 3. Name some key steering system parts.
  • 4. Name some suspension system defects.
  • 5. What three kinds of emergency equipment must you have?
  • 6. What is the minimum tread depth for front tires?
  • 7. Name some things you should check on the front of your vehicle during the walk-around inspection.
  • 8. What should wheel bearing seals be checked for?
  • 9. How many red reflective triangles should you carry?
  • 10. How do you test hydraulic brakes for leaks?
  • 11. Why put the starter switch key in your pocket during the pre-trip inspection?

Basic Control Of Your Vehicle

To drive a vehicle safely, you must be able to control its speed and direction. Safe operation of a commercial vehicle requires skill in:

  • Accelerating - Speed up smoothly and gradually so the vehicle does not jerk. Rough acceleration can cause mechanical damage. When pulling a trailer, rough acceleration can damage the coupling.
  • Steering - Hold the steering wheel firmly with both hands. Your hands should be on opposite sides of the wheel. If you hit a curb or a pothole (chuckhole), the wheel could pull away from your hands unless you have a firm hold.
  • Stopping - Push the brake pedal down gradually. The amount of brake pressure you need to stop the vehicle will depend on the speed of the vehicle and how quickly you need to stop. Control the pressure so the vehicle comes to a smooth, safe stop. If you have a manual transmission, push the clutch in when the engine is close to idle.
  • Backing safely - Because you cannot see everything behind your vehicle, backing is always dangerous. Avoid backing whenever you can. When you park, try to park so you will be able to pull forward when you leave.

Backing Safely

When you have to backup, here are some simple safety rules:

  • Start in the Proper Position - Put the vehicle in the best position to allow you to back safely. This position will depend on the type of backing to be done.
  • Look at Your Path - Look at your line of travel before you begin. Get out and walk around the vehicle. Check your clearance to the sides and overhead, in and near the path your vehicle will take.
  • Use Mirrors on Both Sides - Check the outside mirrors on both sides frequently. Get out of the vehicle and check your path if you are unsure.
  • Back Slowly - Always back as slowly as possible. Use the lowest reverse gear so you can more easily correct any steering errors. You also can stop quickly if necessary.
  • Back and Turn Toward the Driver's Side - Back to the driver's side so you can see better. Backing toward the right side is very dangerous because you cannot see as well. If you back and turn toward the driver's side, you can watch the rear of your vehicle by looking out the side window.
  • Use driver-side backing - even if it means going around the block to put your vehicle in this position. The added safety is worth it.
  • Use a Helper - Use a helper when you can. There are blind spots you cannot see, so a helper is important. The helper should stand near the back of your vehicle where you can see the helper. Before you begin backing, work out a set of hand signals that you both understand. Agree on a signal for "stop."

Shifting Gears

There are a couple of special conditions where you should downshift:

Before Starting Down a Hill - Slow down and shift down to a speed that you can control without using the brakes hard. Otherwise the brakes can overheat and lose their braking power. Downshift before starting down the hill. Make sure you are in a low enough gear, usually lower than the gear required to climb the same hill.

Before Entering a Curve - Slow down to a safe speed and downshift to the right gear before entering the curve. This lets you use some power through the curve to help the vehicle be more stable while turning. It also allows you to speed up as soon as you are out of the curve.

More Questions You Should Be Able To Answer

  • 1. Why should you back toward the driver's side?
  • 2. If stopped on a hill, how can you start moving without rolling back?
  • 3. When backing, why is it important to use a helper?
  • 4. What's the most important hand signal that you and the helper should agree on?
  • 5. What are the two special conditions where you should downshift?
  • 6. When should you downshift automatic transmissions?
  • 7. Retarders keep you from skidding when the road is slippery. True or False?
  • 8. What are the two ways to know when to shift?

Stopping Distance

This is very important to know and may be asked about on your CDL exams:

Total Stopping Distance = Perception Distance + Reaction Distance + Braking Distance

Perception distance - The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it. Keep in mind, certain mental and physical conditions can affect your perception distance. It can be affected greatly depending on visibility and the hazard itself. The average perception time for an alert driver is 1 3/4 seconds. At 55 mph, this accounts for 142 feet traveled.

Reaction distance - The distance you will continue to travel, in ideal conditions; before you physically hit the brakes in response to a hazard seen ahead. The average driver has a reaction time of 3/4 second to one second. At 55 mph this accounts for 61 feet traveled.

Braking distance - The distance your vehicle will travel, in ideal conditions; while you are braking. At 55 mph on dry pavement with good brakes, it can take about 216 feet.

Total stopping distance - The total minimum distance your vehicle has traveled, in ideal conditions; with everything considered, including perception distance, reaction distance and braking distance, until you can bring your vehicle to a complete stop. At 55 mph, your vehicle will travel a minimum of 419 feet. (See Figure 2.11.)

The Effect Of Speed And Weight On Stopping Distance

The Effect of Speed on Stopping Distance - The faster you drive, the greater the impact or striking power of your vehicle. When you double your speed from 20 to 40 mph the impact is four times greater. The braking distance is also four times longer. Triple the speed from 20 to 60 mph and the impact and braking distance is nine times greater. At 60 mph, your stopping distance is greater than the length of a football field. Increase the speed to 80 mph, and the impact and braking distance are 16 times greater than at 20 mph. High speeds greatly increase the severity of crashes and stopping distances. By slowing down, you can reduce braking distance.

The Effect of Vehicle Weight on Stopping Distance - The heavier the vehicle, the more work the brakes must do to stop it and the more heat they absorb. The brakes, tires, springs and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded. Empty trucks require greater stopping distances because an empty vehicle has less traction.

Identifying Slippery Surfaces

Sometimes it is hard to know if the road is slippery. Following are signs of slippery roads:

  • Shaded Areas - Shady parts of the road will remain icy and slippery long after open areas have melted.
  • Bridges - When the temperature drops, bridges will freeze before the road will. Be especially careful when the temperature is close to 32F.
  • Melting Ice - Slight melting will make ice wet. Wet ice is much more slippery than ice that is not wet.
  • Black Ice - Black ice is a thin layer that is clear enough that you can see the road underneath it. It makes the road look wet. Any time the temperature is below freezing and the road looks wet, watch out for black ice.
  • Vehicle Icing - An easy way to check for ice is to open the window and feel the front of the mirror, mirror support or antenna. If there's ice on these, the road surface is probably starting to ice up.
  • Just After Rain Begins - Right after it starts to rain, the water mixes with oil left on the road by vehicles. This makes the road very slippery. If the rain continues, it will wash the oil away.
  • Hydroplaning - In some weather, water or slush collects on the road. When this happens, your vehicle can hydroplane. It is like water skiing - the tires lose contact with the road and have little or no traction. You may not be able to steer or brake. You can regain control by releasing the accelerator and pushing in the clutch. This will slow your vehicle and let the wheels turn freely. If the vehicle is hydroplaning, do not use the brakes to slow down. If the drive wheels start to skid, push in the clutch to let them turn freely

More Questions You Should Know Before Taking The CDL Exam

  • 1. How far ahead does the manual say you should look?
  • 2. What are two main things to look for ahead?
  • 3. What's your most important way to see the sides and rear of your vehicle?
  • 4. What does "communicating" mean in safe driving?
  • 5. Where should your reflectors be placed when stopped on a divided highway?
  • 6. What three things add up to total stopping distance?
  • 7. If you go twice as fast, will your stopping distance increase by two or four times?
  • 8. Empty trucks have the best braking. True or False?
  • 9. What is hydroplaning?
  • 10. What is "black ice?”

Making Turns Safely

Right Turns:

Following are some rules to help prevent right-turn crashes:

  • Turn slowly to give yourself and others more time to avoid problems.
  • If you are driving a truck or bus that cannot make the right turn without swinging into another lane, turn wide as you complete the turn. Keep the rear of your vehicle close to the curb. This will stop other drivers from passing you on the right.
  • Do not turn wide to the left as you start the turn. A following driver may think you are turning left and try to pass you on the right. You may crash into the other vehicle as you complete your turn.
  • If you must cross into the oncoming lane to make a turn, watch out for vehicles coming toward you. Give them room to go by or to stop. However, do not back up for them, because you might hit someone behind you.

Left Turns:

  • On a left turn, make sure you have reached the center of the intersection before you start the left turn. If you turn too soon, the left side of your vehicle may hit another vehicle because of off tracking.
  • If there are two turning lanes, always take the right turn lane. Do not start in the inside lane because you may have to swing right to make the turn. Drivers on your left can be more readily seen.

More Questions You Should Be Able To Answer

  • 1. How do you find out how many seconds of following distance space you have?
  • 2. If you are driving a 30-foot vehicle at 55 mph, how many seconds of following distance should you allow?
  • 3. You should decrease your following distance if somebody is following you too closely. True or False?
  • 4. If you swing wide to the left before turning right, another driver may try to pass you on the right. True or False?
  • 5. What is a hazard?
  • 6. Why make emergency plans when you see a hazard?

Distracted Driving

Whenever you are driving a vehicle and your attention is not on the road, you are putting yourself, your passengers, other vehicles and pedestrians in danger. Distracted driving can result when performing any activity that may shift your full attention from the driving task. Taking your eyes off the road or hands off the steering wheel presents obvious driving risks. Mental activities that take your mind away from driving are just as dangerous. Your eyes can gaze at objects in the driving scene but fail to see them because your attention is distracted elsewhere.

Activities that can distract your attention include: talking to passengers; adjusting the radio, CD player or climate controls; eating, drinking or smoking; reading maps or other literature; picking up something that fell; reading billboards and other road advertisements; watching other people and vehicles including aggressive drivers; talking on a cellphone or CB radio; using telematic devices (such as navigation systems, pagers, etc.); daydreaming or being occupied with other mental distractions.

Railroad Crossings

Railroad crossings with steep approaches can cause your unit to hang up on the tracks. Never permit traffic conditions to trap you in a position where you have to stop on the tracks. Be sure you can get all the way across the tracks before you start across. It takes a typical tractor-trailer unit at least 14 seconds to clear a single track and more than 15 seconds to clear a double track.

Do not shift gears while crossing railroad tracks.

Mountain Driving

Select the Right Gear Before Starting Down the Grade.

You must use the braking effect of the engine as the principal way of controlling your speed. The braking effect of the engine is greatest when it is near the governed rpms and the transmission is in the lower gears. Save your brakes so you will be able to slow or stop as required by road and traffic conditions.

Shift the transmission to a low gear before starting down the grade. Do not try to downshift after your speed has already built up. You will not be able to shift into a lower gear. You may not even be able to get back into any gear and all engine braking effect will be lost. Forcing an automatic transmission into a lower gear at high speed could damage the transmission and also lead to loss of all engine braking effect.

With older trucks, a rule for choosing gears is to use the same gear going down a hill that you would need to climb the hill. However, new trucks have low friction parts and streamlined shapes for fuel economy. They may also have more powerful engines. This means they can go up hills in higher gears and have less friction and air drag to hold them back going down hills. For that reason, drivers of modern trucks may have to use lower gears going down a hill than would be required to go up the hill. You should know what is right for your vehicle.

Proper Mountain Braking Techniques

Remember — The use of brakes on a long and/or steep downgrade is only a supplement to the braking effect of the engine. Once the vehicle is in the proper low gear, the following are the proper braking techniques:

  • 1.Apply the brakes just hard enough to feel a definite slowdown.
  • 2. When your speed has been reduced to approximately 5 mph below your "safe" speed, release the brakes.
  • 3. When your speed has increased to your "safe" speed, repeat Steps 1 and 2.

For example, if your "safe" speed is 40 mph, you would not apply the brakes until your speed reaches 40 mph. You now apply the brakes hard enough to gradually reduce your speed to 35 mph and then release the brakes. Repeat this as often as necessary until you have reached the end of the downgrade.

More Questions You Should Know

  • 1. What factors determine your selection of a "safe" speed when going down a long, steep downgrade?
  • 2. Why should you be in the proper gear before starting down a hill?
  • 3. Describe the proper braking technique when going down a long, steep downgrade.
  • 4. What type of vehicles can get stuck on a railroad-highway crossing?
  • 5. How long does it take for a typical tractor-trailer unit to clear a double track?

Stopping Quickly

If somebody suddenly pulls out in front of you, your natural response is to hit the brakes. This is a good response if there is enough distance to stop and you use the brakes correctly. You should brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary. You can use the "controlled braking" method or the "stab braking" method.

Controlled braking: With this method, you apply the brakes as hard as you can without locking the wheels. Keep steering wheel movements very small while doing this. If you need to make a larger steering adjustment or if the wheels lock, release the brakes. Re-apply the brakes as soon as you can.

Stab braking:

  • Apply your brakes all the way.
  • Release brakes when wheels lock up.
  • As soon as the wheels start rolling, apply the brakes fully again. (It can take up to one second for the wheels to start rolling after you release the brakes. If you re-apply the brakes before the wheels start rolling, the vehicle won't straighten out.)

Do not jam on the brakes: Emergency braking does not mean pushing down on the brake pedal as hard as you can. That will only keep the wheels locked up and cause a skid. If the wheels are skidding, you cannot control the vehicle.

Becoming Sleepy Behind The Wheel

When you are sleepy, trying to "push on" is far more dangerous than most drivers think. It is a major cause of fatal accidents. Here are some important rules to follow:

  • Stop to Sleep: When your body needs sleep, sleep is the only thing that will work. If you have to make a stop anyway, make it whenever you feel the first signs of sleepiness, even if it is earlier than you planned. By getting up a little earlier the next day, you can keep on schedule without the danger of driving while you are not alert.
  • Take a Nap: If you cannot stop for the night, at least pull off at a safe place, such as a rest area or truck stop, and take a nap. A nap as short as a half-hour will do more to overcome fatigue than a half-hour coffee stop.
  • Avoid Drugs: There are no drugs that can overcome being tired. While they may keep you awake for a while, they won't make you alert. And eventually, you will be even more tired than if you had not taken them at all. Sleep is the only thing that can overcome fatigue.

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