South Dakota DPS Permit Practice Test 25
- Questions25
- Correct to pass20
- Passing score80%
- Minimum age14 years
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1. Which family of signs normally uses a rectangle that is wider than it is tall?
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Answer B: Guide signs, which name routes and destinations
Guide signs are laid out as horizontal rectangles because they have to carry route numbers, place names and distances side by side.
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2. You find yourself in a lane that must turn, you wanted to go straight, and you cannot change lanes safely. What should you do?
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Answer D: Make the required turn and find another route
Going straight from a mandatory turn lane surprises everyone around you, while a wrong turn costs only a few extra minutes.
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3. The inside of your windshield keeps fogging up on a cold, damp day. What clears it best?
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Answer B: The defroster with the air conditioning on, which dries the air
Fog on the inside is moisture from the cabin air. The air conditioner dries that air, and the defroster warms the glass, so together they clear it and keep it clear.
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4. You reach an intersection with no signs, signals or markings clearly before a vehicle that is approaching on your right. What is the rule?
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Answer B: You may go first because you got there first
At an uncontrolled intersection the first driver to arrive goes first; the yield to the right rule only settles a tie.
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5. You are stopped at an intersection where bushes block your view of cross traffic. What should you do?
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Answer A: Edge forward slowly until you can see, then proceed when clear
Creeping forward a little at a time lets you gain a view without committing to the crossing. Never enter an intersection you cannot see into.
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6. A steady downward green arrow is displayed over a lane. What does it indicate?
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Answer C: The lane is open to traffic in your direction
A steady downward green arrow means the lane it points to is open to traffic traveling in your direction.
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7. In South Dakota, what must you do when you approach a stopped emergency vehicle that is using red visual signals?
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Answer D: Come to a complete stop before reaching it and proceed only when it is safe
South Dakota requires drivers coming from any direction to stop completely before reaching a stopped emergency vehicle displaying red lights, then proceed with caution once it is safe.
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8. At what tread depth should a tire be replaced?
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Answer A: When the tread is worn down to 2/32 of an inch
At that depth a tire loses grip quickly, especially on wet roads, and the built in wear bars or the penny test both show when the point has been reached.
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9. You are waiting in a center two-way left-turn lane. What should you expect from oncoming traffic?
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Answer A: Oncoming drivers may enter the same lane to prepare their own left turns
Both directions share a two-way left-turn lane, so an oncoming vehicle may be waiting in it and you must never treat it as yours alone.
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10. Why is a shoulder check especially important on a road with motorcycles and bicycles?
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Answer D: A narrow vehicle can disappear completely in the blind spot
A motorcycle or a bicycle is small enough to be hidden entirely by a door pillar or by the blind spot the mirrors do not cover.
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11. Your loaded vehicle weighs more than the figure shown on a posted weight limit sign. What must you do?
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Answer D: Find another route, because crossing is not permitted
A posted weight limit is a legal maximum, not advice, so an overweight vehicle has to take a different route.
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12. At many crossings the walk indication appears only after a button is pressed. What happens if a pedestrian does not press it?
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Answer B: The signal may cycle without showing a walk indication
An actuated pedestrian phase is called in by the pushbutton, so without it the controller may serve the vehicle movements alone.
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13. Why is it useful to watch the vehicle two or three places ahead of you?
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Answer C: You get an earlier warning of slowing traffic than brake lights give
Trouble travels back through a line of traffic, so seeing it start several vehicles ahead gives you a head start on braking.
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14. A sign beside the signal reads STOP HERE ON RED. What does it tell you?
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Answer B: Stop at that point on red, not closer to the intersection
The sign marks the required stopping point, which is set back from the corner so that turning vehicles and sight lines are not blocked.
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15. You are the second vehicle waiting to turn left on a green ball. Where should you wait?
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Answer A: Behind the stop line, until the first vehicle has actually turned
Only the lead vehicle should move into the intersection to wait; a second vehicle inside it is likely to be stranded there when the light changes.
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16. A driver on the street this sign governs is preparing to turn left at the next corner. Which lane should the vehicle be in beforehand?
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Answer A: The lane closest to the left curb
All the traffic here runs the same way, so nothing is coming toward the driver and the turn is taken from the extreme left lane rather than from beside the middle of the roadway.
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17. A driver in the left lane of a freeway realizes only when level with this sign that the ramp beside it is the one they need. What is the correct action?
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Answer A: Carry on to the next interchange and turn back from there
There is no safe way back to a ramp once it has been reached from the wrong lane, so the driver keeps going to the next interchange, where the ramps are built for that movement.
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18. For an alert driver, about how long is the reaction time once a hazard has been recognized?
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Answer A: About three quarters of a second
Reaction alone takes roughly three quarters of a second for an alert driver, and perception takes about as long again, so a second and a half of travel is added before the brakes bite.
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19. Apart from giving you room to stop, what else does a longer following gap do for you?
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Answer D: It widens your view of the road and the traffic ahead
Sitting further back lets you see past and around the vehicle in front, so hazards reach your eyes seconds earlier.
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20. What is the safest way to leave a perpendicular parking space in a busy lot?
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Answer B: Back out slowly, checking both ways and yielding
Backing out gives you the poorest view of any maneuver, so it must be done slowly, with checks in both directions and with yielding to whoever is already there.
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21. How much moving water is generally enough to float and carry away most passenger vehicles?
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Answer D: About one foot
About a foot of moving water will float most cars, and even less will stall an engine. That is why the rule is to turn around instead of judging the depth.
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22. You want to turn right at a steady red light and no sign prohibits the turn. What is required?
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Answer B: Come to a complete stop, then yield to traffic and pedestrians before turning
A right turn on a steady red is permitted only after a complete stop and only after yielding to cross traffic and to pedestrians, and a posted sign can prohibit it entirely.
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23. 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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24. On a school speed limit sign, the part carrying the word SCHOOL is shown
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Answer A: in black on a fluorescent yellow-green background
The SCHOOL portion of the school speed limit sign uses the same fluorescent yellow-green background as school warning signs, while the speed portion keeps the standard regulatory appearance.
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25. When is a driver or rider most likely to need hand and arm signals instead of the vehicle turn signal lamps?
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Answer D: When the lamps have failed or cannot be seen because of glare or a load
Hand and arm signals replace or reinforce the lamps whenever the lamps do not work or cannot be seen clearly by other road users.