South Carolina SCDMV Permit Practice Test 37
- Questions30
- Correct to pass24
- Passing score80%
- Minimum age15 years
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1. How does the blood alcohol standard for a driver operating a commercial vehicle compare with the one for a car driver?
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Answer D: It is lower, set at 0.04
Commercial drivers are held to a stricter standard of 0.04 because of the size of their vehicles and the risk they carry.
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2. How much more energy must your brakes absorb if you double your speed?
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Answer D: About four times as much, since energy rises with the square of speed
Kinetic energy grows with the square of speed, so twice the speed means about four times the energy and a far longer braking distance.
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3. Traffic in a work zone is down to one lane in each direction, separated by a temporary double yellow line. May you pass?
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Answer C: No, temporary markings prohibit passing just as permanent ones do
A temporary marking has the same legal force as a permanent one, and a work zone is the last place with room to spare for an overtaking vehicle.
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4. A child seat was in the car during a moderate crash. What should be done with it?
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Answer A: Replace it, because a seat that has been through a crash may be weakened
Crash forces can damage a seat in ways you cannot see, so a seat involved in anything but the mildest crash is replaced.
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5. Why is being predictable an important part of driving safely?
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Answer A: Because other road users are able to plan around what you are doing
Other drivers make their decisions from what they expect you to do, so surprises are what produce collisions.
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6. What penalty does South Carolina impose for a second distracted driving conviction within three years?
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Answer C: A 200 dollar fine that cannot be suspended plus two points on the record
A first offense is a 100 dollar fine, and a second or later offense within three years brings a 200 dollar fine that may not be suspended plus two points on the driving record.
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7. A square sign with a red field, a wide white horizontal bar and the words DO NOT ENTER tells a driver that
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Answer B: the roadway ahead must not be entered from that point
The do not enter sign is posted at the end of a one-way roadway or ramp to keep traffic from driving into it against the flow.
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8. Crossing a parking lot on a hot day, you see a young child alone in a locked car. What should you do?
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Answer A: Call 911 right away and stay with the vehicle
The inside of a parked car can reach lethal temperatures within minutes, so a child left alone in one is an emergency.
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9. You are turning left across tracks that run along the center of the street. What should you do before crossing them?
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Answer B: Look along the tracks in both directions and cross only when clear
Rail vehicles running in the street can arrive from either direction and cannot stop quickly, so look along the tracks before you turn across them.
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10. The crossing gates begin to lower while your vehicle is still on the railroad tracks. What should you do?
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Answer B: Keep going forward and push through the gate if it should block your way
Gates are made to break away, and driving forward off the tracks is far safer than staying between them or backing up.
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11. How far should the driver chest be from the steering wheel?
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Answer B: At least about ten inches
The airbag deploys with great force in the first instants of a crash, so about ten inches between your chest and the wheel is the recommended minimum.
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12. In a work zone a flagger signals you to stop, but the sign beside the road says the lane is open. What should you do?
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Answer C: Obey the flagger
A flagger controls the work zone in real time and the instruction outranks the signs and markings, which cannot reflect what is happening at that moment.
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13. How does a lap and shoulder belt protect you in a crash?
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Answer B: It holds you to the seat and spreads the force over the strong bones
The belt keeps you with the vehicle as it slows and puts the load on the hips and the chest rather than on soft tissue.
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14. A bike lane on your right is marked with a dashed line for the last stretch before the corner. What does that dashed section allow you to do?
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Answer D: Merge into the bike lane after checking, and turn right from there
The dashed section is where drivers are meant to merge into the bike lane before turning, which puts cyclists behind the vehicle instead of beside it.
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15. Under South Carolina's child passenger restraint law, when may a child use an adult safety belt?
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Answer A: When the child is at least 8 years old or at least 57 inches tall and the belt fits properly
A child at least eight years old or at least fifty-seven inches tall may use an adult belt if the lap belt crosses the thighs and hips and the shoulder belt crosses the center of the chest.
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16. A sign reads END SCHOOL ZONE. What does it tell a driver?
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Answer A: The regular limit for that road applies again
An end of restriction sign marks the downstream limit of a special zone, after which the ordinary speed limit for that road governs again.
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17. The center line beside your lane is a broken yellow line. What does it allow?
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Answer D: You may cross into the opposing lane to pass when it is safe and clear
A broken yellow center line marks a passing zone where traffic in that direction may cross into the opposing lane to pass when the way ahead is clear.
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18. A flashing red arrow is displayed for your turning lane. What does it require?
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Answer D: Stopping, then turning when the way is clear
A flashing red arrow is treated like a stop sign for that movement: come to a full stop, then turn when it is safe and no one has to be cut off.
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19. You are making a U-turn at a signal on a green left arrow. Who must you still watch for?
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Answer D: People in the crosswalk you will cross as you come around
Even a protected arrow does not clear the crosswalk, and a U-turn sweeps across a crosswalk that pedestrians may already be using.
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20. How should a driver respond to this sign?
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Answer C: Slow down before reaching the rough spot and cross it at a steady, low speed
Losing speed before a sharp rise in the pavement keeps the vehicle settled, while braking or accelerating on top of it unsettles the suspension and costs grip.
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21. What does a broken line indicate, whatever color it is painted?
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Answer C: That crossing it is permitted
A broken line always describes a permissive condition, and the color then tells the driver whether the traffic beyond it runs the same way or the opposite way.
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22. A funeral procession with headlights on is crossing an intersection when your light turns green. What should you do?
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Answer A: Wait and let the whole procession go through
Most states let a funeral procession stay together once the lead vehicle has lawfully entered an intersection, and in every state you must yield to vehicles already in the intersection, so wait until the line has passed.
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23. You approach a one-lane bridge and there is a yield sign facing your side of it. What does that mean?
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Answer B: Oncoming traffic crosses the bridge first and you wait at the approach
At a one-lane bridge the yield sign tells one direction to give way, so you wait clear of the bridge until oncoming traffic has crossed.
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24. What do white lane lines painted between travel lanes indicate?
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Answer A: Traffic in the adjacent lane moves in the same direction as you
White markings separate lanes carrying traffic in the same direction and mark the right edge of the roadway.
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25. A dust storm is blowing across the highway ahead of you. What is the recommended response?
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Answer B: Leave the road if you can, park well clear and take your foot off the brake
Get well off the pavement, switch the lights off and keep your foot off the brake, so drivers still on the road do not follow your tail lights off the highway.
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26. A piece of farm machinery ahead of you is wider than its own lane. What should you do?
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Answer C: Hold back until you can see far enough to pass safely
Wide equipment leaves no gap inside the lane and may use part of the other side, so a pass needs a long clear view of the road ahead.
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27. The driver of a slow farm vehicle moves partly onto the shoulder and waves you past. Who is responsible for the pass?
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Answer A: You are, so pass only if you can see that the road is clear
A courtesy wave is not a traffic control, and the driver who changes lanes is the one answerable for the maneuver.
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28. You arrive at an intersection with no signs, no signals and no markings at the same time as a vehicle on the road to your right. What must you do?
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Answer B: Yield to the vehicle on your right
At an uncontrolled intersection you must yield to a vehicle already in the intersection or approaching from your right.
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29. How do you avoid the sharp nod at the end of a stop?
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Answer A: Ease the pedal pressure off slightly just before the vehicle stops
The nod comes from the suspension unloading at the instant the wheels stop. Releasing a little pressure at the end lets the vehicle settle smoothly.
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30. A traffic signal is displaying a flashing red light. How must you treat it?
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Answer D: Stop completely, then proceed when the way is clear
A flashing red carries the same meaning as a stop sign: come to a full stop, then go only when it is safe.