Idaho General Knowledge Practice Test

This is our Idaho General Knowledge Practice Quiz and Practice Test compiled of 50 questions each. Each question is worth two points for a total of 100 possible points. A passing score is 80%.

The General Knowledge Practice Quiz reveals the correct answer during each question to help you study for the actual General Knowledge test. The General Knowledge Practice Test doesn’t reveal the correct answers until the test is over.

The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy. 

Press the start button to begin your free General Knowledge Practice Quiz. Good luck!

General Knowledge CDL Practice Quiz

Start

Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, reaction distance, and braking distance.
B	Observation distance, reaction distance, and slowing distance.
C	Perception distance, response distance, and reaction distance.
D	Perception distance, slowing distance, and braking distance.

Question 2

Which of the following fires can be safely extinguished by water?

A	None of these fires can be safely extinguished by water.
B	Gasoline fire.
C	Grease fire.
D	Electrical fire.

Question 3

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of three.
B	A minimum of two.
C	A minimum of one.
D	A minimum of four.

Question 4

You know your brakes are fading when:

A	the brake pedal feels firm when you apply pressure.
B	you have to push harder and harder to get the same stopping power on a downgrade.
C	there is a slight vibration when you press down on the brake pedal.
D	you release pressure on the brake pedal and speed increases.

Question 5

When a coolant container is part of a pressurized system, you can:

A	use only water in the cooling system.
B	check the coolant level of a hot engine.
C	use windshield washer fluid as coolant.
D	safely remove the radiator cap and add coolant while the engine is hot.

Question 6

The two main causes of tire fires are ______ and ______.

A	under-inflated tires, dual tires that touch
B	over-heated brakes, under-inflated tires
C	dual tires that touch, hot road surfaces
D	poor-quality retreads, under-inflated tires

Question 7

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	Shorter stopping distance.
B	It depends on what mood you are in at the time.
C	Greater stopping distance.
D	The same amount of stopping distance.

Question 8

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	you will be parked for a short time.
B	there is ice and snow, to prevent skidding.
C	it is absolutely necessary.
D	testing the trailer brakes after hooking up to a trailer.

Question 9

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	three or more.
B	seven or more.
C	none of these.
D	five or more.

Question 10

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Warn other drivers by using your left turn signal lights.
B	Keep your low beam lights on.
C	Put your warning devices out within 15 minutes.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 11

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	roll down your window so that the fresh air will help keep you awake.
C	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
D	keep your high beams on at all times.

Question 12

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	More space than is needed for ideal driving conditions.
B	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 13

One reason why dry bulk tanks require special care is because:

A	the load can shift.
B	the load can catch fire easily.
C	the load should not get wet.
D	a dry bulk tank should only be filled halfway.

Question 14

When loading cargo, what is an important rule to remember?

A	Load cargo weight evenly over all the axles.
B	Load cargo toward the rear of the truck for easier unloading.
C	Load more weight over the drive axle for better traction.
D	Load more cargo toward the front of the truck for a full load.

Question 15

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	keep two hands firmly planted on the steering wheel at all times.
B	keep the cargo as close to the ground as possible.
C	downshift into the turn.
D	check to make sure that the brakes are properly balanced.

Question 16

When backing your vehicle, why should you use a helper?

A	To watch for steering errors.
B	To direct traffic away from you.
C	To prevent others from distracting you.
D	To see the blind spots you can't see.

Question 17

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
B	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
C	Move forward slowly and push firmly on the brake pedal.
D	Push the brake pedal firmly 5 seconds; listen for leaks.

Question 18

Before transporting a sealed load, it is important to check that the:

A	seal is secure.
B	seal is authentic.
C	placard numbers match the seal numbers.
D	load is properly secured.

Question 19

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	to ensure safety for yourself, your passengers, and other drivers.
B	because law enforcement may inspect your vehicle on the road.
C	to help ensure the vehicle will make it to your destination.
D	because it is a requirement for all drivers.

Question 20

Your stopping distance will increase by ______, if you double your speed.

A	four times
B	two times
C	three times
D	half

Question 21

Serious vehicle skids are usually caused by:

A	poorly adjusted brakes.
B	driving too slow for road conditions.
C	driving too fast for road conditions.
D	bad tires.

Question 22

______ can cause a fire.

A	eating spicy food in the truck cab
B	loose fuel connections
C	both loose fuel connections and under inflated tires
D	under inflated tires

Question 23

The minimum tread depth that front tires should have for safety is:

A	4/32-inch in every major groove.
B	3/32-inch in every major groove.
C	2/32-inch in every major groove.
D	5/32-inch in every major groove.

Question 24

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	three
D	four

Question 25

If you become sleepy while driving, you should:

A	stop to sleep.
B	slap yourself in the face three times.
C	turn up the radio.
D	roll down the windows.

Question 26

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Use the same gear you would use to climb the hill.
B	Use a higher gear than you would use to climb the hill.
C	Shift the truck into neutral and coast down the hill to save gas.
D	Use a lower gear than you would use to climb the hill.

Question 27

The braking power of the spring brakes:

A	increases when the service brakes are hot.
B	is not affected by the condition of the service brakes.
C	depends on the service brakes being in adjustment.
D	decreases when the service breaks are hot.

Question 28

Wheel bearing seals should be checked for ______.

A	rubbing
B	rust
C	leaks
D	burning

Question 29

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	one half inch
B	three inches
C	one inch
D	two inches

Question 30

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn wide as you complete the turn
B	turn right and drive over the curb
C	turn wide before you start the turn
D	start the turn, then back up to re-position

Question 31

You should make emergency plans when you see a hazard because:

A	you want to have time to act before it turns into an emergency.
B	it is a federal law.
C	you want to avoid doing something all of a sudden.
D	you want to have a plan to communicate the risk.

Question 32

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Play in the steering wheel of more than five degrees.
B	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
C	Too many vertical stacks.
D	Oil on the tie rod.

Question 33

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rear view cameras
B	sunglasses
C	mirrors
D	rolled down windows

Question 34

Which of the following is considered a hazard?

A	Pedestrians and bicyclists.
B	Road construction zones.
C	A stopped transit bus.
D	All of these are considered a hazard.

Question 35

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is out of brake adjustment.
B	the trailer is empty or lightly loaded.
C	the trailer is fully loaded or very heavy.
D	the trailer is being hauled at high speed.

Question 36

Two main things to look for up ahead while driving are ______ and ______.

A	vehicles, traffic signs
B	truck stops, gas stations
C	tunnels, overpasses
D	law enforcement officers, detours

Question 37

The reason placards are used is:

A	to make your vehicle look official.
B	to warn others of hazardous materials.
C	to avoid mixing hazmat with food.
D	to combat terrorism.

Question 38

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	the kingpin is about 1¼ inches above the fifth wheel.
B	it will be raised slightly when the tractor is backed under it.
C	the end of the kingpin is even with the top of the fifth wheel.
D	the end of the kingpin is at waist level.

Question 39

Why should know the outage needed for the liquids you carry?

A	Because tank baffles are not always legal with outage.
B	Because it's good to know that information.
C	Because some liquids expand more than others when they get warm.
D	Because some of the heaviest liquids don’t need any.

Question 40

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
B	Turn on your four-way flashers as you approach the offramp.
C	Downshift after you are in the curve.
D	Slow to a safe speed before the curve.

Question 41

With regard to safe driving, what does communicating mean?

A	Using a helper when backing up.
B	Using hand signals.
C	Using turn signals, 4-way flashers, headlights, and the horn.
D	Using your CB radio or cell phone to inform others.

Question 42

Rust around a lug nut is a sign that:

A	the lug nut is cheap.
B	the lug nut needs to be replaced.
C	the wheel needs cleaning.
D	the lug nut is loose.

Question 43

The two driving conditions in which you should downshift are:

A	before going up a hill and before entering a curve.
B	before starting down a hill and before going up a hill.
C	before starting down a hill and before entering a tunnel.
D	before starting down a hill and before entering a curve.

Question 44

If your vehicle has a retarder, you should turn it off when:

A	road conditions are excellent.
B	the road is wet, icy, or snow covered.
C	you are driving on the freeway.
D	you are driving on hilly, rural roads.

Question 45

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	Muscle control and coordination are affected.
B	Judgment and self-control are the first to be affected.
C	All of these things happen.
D	The drinker's brain is increasingly affected.

Question 46

Containerized loads are:

A	exempt from hazardous materials restrictions.
B	exempt from weight limit restrictions.
C	generally used when freight is carried part way by rail or ship.
D	exempt from height restrictions.

Question 47

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	sidetracking.
B	fishtailing.
C	offtracking.
D	slidetracking.

Question 48

Empty trucks ______.

A	have the same stopping distance as full trucks
B	require greater stopping distance than full trucks
C	have better traction when stopping than full trucks
D	need less space ahead than full trucks

Question 49

The amount of liquid to load into a tank depends on:

A	both of these.
B	neither of these.
C	the weight of the liquid.
D	the legal weight limits.

Question 50

A pre-trip inspection should be completed:

A	before operating the vehicle.
B	whenever you stop to refuel.
C	at least once a week.
D	if any problems occurred the last the time the vehicle was operated.

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"Dude, Go Back to Truck Driving School" because you FAILED!

"A Bad Truck Driver" because you FAILED! A Bad Truck Driver!

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"A Good Truck Driver" because you PASSED! A Good Truck Driver!

"A Truck Driving Pro" because you PASSED!

Remember, the General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.

Press the start button to begin your free General Knowledge Practice Test. Good luck!

General Knowledge CDL Practice Test

Start

Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rolled down windows
B	mirrors
C	rear view cameras
D	sunglasses

Question 2

Rust around a lug nut is a sign that:

A	the lug nut needs to be replaced.
B	the lug nut is cheap.
C	the lug nut is loose.
D	the wheel needs cleaning.

Question 3

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is fully loaded or very heavy.
B	the trailer is being hauled at high speed.
C	the trailer is empty or lightly loaded.
D	the trailer is out of brake adjustment.

Question 4

Which of the following fires can be safely extinguished by water?

A	Electrical fire.
B	Gasoline fire.
C	Grease fire.
D	None of these fires can be safely extinguished by water.

Question 5

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	It depends on what mood you are in at the time.
B	Greater stopping distance.
C	Shorter stopping distance.
D	The same amount of stopping distance.

Question 6

One reason why dry bulk tanks require special care is because:

A	the load should not get wet.
B	the load can catch fire easily.
C	the load can shift.
D	a dry bulk tank should only be filled halfway.

Question 7

Wheel bearing seals should be checked for ______.

A	rubbing
B	rust
C	burning
D	leaks

Question 8

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Shift the truck into neutral and coast down the hill to save gas.
B	Use a higher gear than you would use to climb the hill.
C	Use a lower gear than you would use to climb the hill.
D	Use the same gear you would use to climb the hill.

Question 9

Any flatbed load must have at least ______ tie downs.

A	one
B	four
C	two
D	three

Question 10

The two main causes of tire fires are ______ and ______.

A	under-inflated tires, dual tires that touch
B	dual tires that touch, hot road surfaces
C	over-heated brakes, under-inflated tires
D	poor-quality retreads, under-inflated tires

Question 11

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	the end of the kingpin is even with the top of the fifth wheel.
B	the end of the kingpin is at waist level.
C	it will be raised slightly when the tractor is backed under it.
D	the kingpin is about 1¼ inches above the fifth wheel.

Question 12

The amount of liquid to load into a tank depends on:

A	both of these.
B	neither of these.
C	the weight of the liquid.
D	the legal weight limits.

Question 13

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn wide as you complete the turn
B	turn right and drive over the curb
C	start the turn, then back up to re-position
D	turn wide before you start the turn

Question 14

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	one inch
B	three inches
C	two inches
D	one half inch

Question 15

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	because it is a requirement for all drivers.
B	to help ensure the vehicle will make it to your destination.
C	to ensure safety for yourself, your passengers, and other drivers.
D	because law enforcement may inspect your vehicle on the road.

Question 16

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Move forward slowly and push firmly on the brake pedal.
B	Push the brake pedal firmly 5 seconds; listen for leaks.
C	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
D	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.

Question 17

If you become sleepy while driving, you should:

A	slap yourself in the face three times.
B	stop to sleep.
C	roll down the windows.
D	turn up the radio.

Question 18

Two main things to look for up ahead while driving are ______ and ______.

A	truck stops, gas stations
B	tunnels, overpasses
C	law enforcement officers, detours
D	vehicles, traffic signs

Question 19

When you are driving at night, you should:

A	keep your high beams on at all times.
B	drink coffee or other caffeine products to help keep you awake.
C	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
D	roll down your window so that the fresh air will help keep you awake.

Question 20

When a coolant container is part of a pressurized system, you can:

A	use windshield washer fluid as coolant.
B	check the coolant level of a hot engine.
C	use only water in the cooling system.
D	safely remove the radiator cap and add coolant while the engine is hot.

Question 21

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Keep your low beam lights on.
B	Put your warning devices out within 15 minutes.
C	Warn other drivers by using your left turn signal lights.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 22

______ can cause a fire.

A	both loose fuel connections and under inflated tires
B	underinflated tires
C	overinflated tires
D	loose fuel connections

Question 23

The reason placards are used is:

A	to make your vehicle look official.
B	to combat terrorism.
C	to avoid mixing hazmat with food.
D	to warn others of hazardous materials.

Question 24

You know your brakes are fading when:

A	you release pressure on the brake pedal and speed increases.
B	there is a slight vibration when you press down on the brake pedal.
C	you have to push harder and harder to get the same stopping power on a downgrade.
D	the brake pedal feels firm when you apply pressure.

Question 25

Why should know the outage needed for the liquids you carry?

A	Because some of the heaviest liquids don’t need any.
B	Because it's good to know that information.
C	Because tank baffles are not always legal with outage.
D	Because some liquids expand more than others when they get warm.

Question 26

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
B	Play in the steering wheel of more than five degrees.
C	Oil on the tie rod.
D	Too many vertical stacks.

Question 27

With regard to safe driving, what does communicating mean?

A	Using hand signals.
B	Using a helper when backing up.
C	Using turn signals, 4-way flashers, headlights, and the horn.
D	Using your CB radio or cell phone to inform others.

Question 28

The braking power of the spring brakes:

A	decreases when the service breaks are hot.
B	depends on the service brakes being in adjustment.
C	increases when the service brakes are hot.
D	is not affected by the condition of the service brakes.

Question 29

When loading cargo, what is an important rule to remember?

A	Load more weight over the drive axle for better traction.
B	Load more cargo toward the front of the truck for a full load.
C	Load cargo toward the rear of the truck for easier unloading.
D	Load cargo weight evenly over all the axles.

Question 30

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, response distance, and reaction distance.
B	Perception distance, slowing distance, and braking distance.
C	Observation distance, reaction distance, and slowing distance.
D	Perception distance, reaction distance, and braking distance.

Question 31

Serious vehicle skids are usually caused by:

A	poorly adjusted brakes.
B	bad tires.
C	driving too fast for road conditions.
D	driving too slow for road conditions.

Question 32

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	The drinker's brain is increasingly affected.
B	Judgment and self-control are the first to be affected.
C	All of these things happen.
D	Muscle control and coordination are affected.

Question 33

When backing your vehicle, why should you use a helper?

A	To prevent others from distracting you.
B	To watch for steering errors.
C	To direct traffic away from you.
D	To see the blind spots you can't see.

Question 34

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	five or more.
B	none of these.
C	seven or more.
D	three or more.

Question 35

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of one.
B	A minimum of four.
C	A minimum of two.
D	A minimum of three.

Question 36

If your vehicle has a retarder, you should turn it off when:

A	you are driving on hilly, rural roads.
B	the road is wet, icy, or snow covered.
C	you are driving on the freeway.
D	road conditions are excellent.

Question 37

Before transporting a sealed load, it is important to check that the:

A	placard numbers match the seal numbers.
B	seal is secure.
C	seal is authentic.
D	load is properly secured.

Question 38

Which of the following is considered a hazard?

A	All of these are considered a hazard.
B	Road construction zones.
C	A stopped transit bus.
D	Pedestrians and bicyclists.

Question 39

The two driving conditions in which you should downshift are:

A	before starting down a hill and before going up a hill.
B	before starting down a hill and before entering a curve.
C	before going up a hill and before entering a curve.
D	before starting down a hill and before entering a tunnel.

Question 40

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	testing the trailer brakes after hooking up to a trailer.
B	it is absolutely necessary.
C	you will be parked for a short time.
D	there is ice and snow, to prevent skidding.

Question 41

You should make emergency plans when you see a hazard because:

A	it is a federal law.
B	you want to have time to act before it turns into an emergency.
C	you want to avoid doing something all of a sudden.
D	you want to have a plan to communicate the risk.

Question 42

The minimum tread depth that front tires should have for safety is:

A	5/32-inch in every major groove.
B	2/32-inch in every major groove.
C	4/32-inch in every major groove.
D	3/32-inch in every major groove.

Question 43

Empty trucks ______.

A	have better traction when stopping than full trucks
B	require greater stopping distance than full trucks
C	have the same stopping distance as full trucks
D	need less space ahead than full trucks

Question 44

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	The same amount of space you would at night.
B	The same amount of space you would on a dry road.
C	More space than is needed for ideal driving conditions.
D	One vehicle length for every 10,000 lb. of gross vehicle weight.

Question 45

A pre-trip inspection should be completed:

A	if any problems occurred the last the time the vehicle was operated.
B	whenever you stop to refuel.
C	before operating the vehicle.
D	at least once a week.

Question 46

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	keep the cargo as close to the ground as possible.
B	keep two hands firmly planted on the steering wheel at all times.
C	check to make sure that the brakes are properly balanced.
D	downshift into the turn.

Question 47

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Downshift after you are in the curve.
B	Turn on your four-way flashers as you approach the offramp.
C	Slow to a safe speed before the curve.
D	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.

Question 48

Containerized loads are:

A	exempt from hazardous materials restrictions.
B	exempt from weight limit restrictions.
C	exempt from height restrictions.
D	generally used when freight is carried part way by rail or ship.

Question 49

Your stopping distance will increase by ______, if you double your speed.

A	half
B	four times
C	two times
D	three times

Question 50

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	slidetracking.
B	offtracking.
C	sidetracking.
D	fishtailing.

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 50 questions to complete.

←

List

→

Return

Shaded items are complete.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
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"Dude, Go Back to Truck Driving School" because you FAILED!

"A Bad Truck Driver" because you FAILED!

"An Amateur Truck Driver" because you FAILED! "An Amateur Truck Driver!"

"A Good Truck Driver" because you PASSED!

"A Truck Driving Pro" because you PASSED!

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