Iowa DOT Permit Practice Test 22
- Questions25
- Correct to pass20
- Passing score80%
- Minimum age14 years
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1. Your vehicle has daytime running lights. Why should you still switch on the headlights at dusk?
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Answer B: Daytime running lights usually do not light the tail lights, so you are hard to see from behind
On many vehicles the daytime running lights illuminate only the front. Without the headlight switch on, the rear of the vehicle stays dark and the dash may still look lit.
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2. A raised area crosses the roadway and carries a series of white markings on its face. What are those markings for?
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Answer A: To make the hump visible so drivers slow for it
Speed hump markings warn drivers that the pavement rises, which matters most at night or when the hump is in shadow.
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3. A reduced speed limit posted with this sign and a plaque giving hours is in force
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Answer C: during the hours shown on the plaque, or while the beacon is flashing
A school speed limit applies during the periods stated on the plaque or while the attached beacon flashes, and the regular limit governs outside those periods.
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4. Where should the lap part of the seat belt sit?
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Answer C: Low and snug across the hips, touching the tops of both of the thighs
The hip bones can take crash forces, but the abdomen cannot, so the lap belt goes low and tight across the hips.
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5. 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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6. What most often starts a rear wheel skid?
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Answer A: Too much speed, braking or acceleration for the grip available
A skid begins when what you ask of the tires exceeds what the surface can give, which is usually a matter of speed and of how abruptly you use the controls.
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7. You park facing downhill on a one-way street where the curb is on your left. Which way do the front wheels go?
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Answer A: Left, toward the curb on that side
Standard practice follows the curb rather than the side of the road: facing downhill the wheels point into the curb so a rolling vehicle is stopped by it. States differ on whether this is legally required.
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8. On a clear day with light traffic, a driver stays far below the maximum this sign sets. What can that cause?
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Answer B: Obstruction of the normal flow of traffic, which is prohibited in itself
Driving so slowly that other traffic is impeded is an offense in its own right when nothing about safety, weather or the road calls for it.
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9. What does a traction control system do?
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Answer A: It limits wheel spin when you accelerate
Traction control cuts power or brakes a spinning wheel so the tires can grip when you pull away or accelerate on a slippery surface.
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10. Two left-turn lanes are marked at the intersection and you are in the left one. What must you do?
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Answer A: Stay in your own lane all the way around the turn
With dual turn lanes each driver must hold a lane through the whole turn and come out in the matching lane of the new street.
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11. How long must an Iowa instruction permit be held before the holder may apply for an intermediate license?
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Answer C: A minimum of 12 months
Iowa Code section 321.180B requires the applicant to have held the instruction permit for a minimum of twelve months immediately preceding the application for an intermediate license.
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12. You have brought the vehicle under control after a blowout. What should you do next?
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Answer A: Signal and coast well off the road before stopping
Let the speed fall, signal, and leave the roadway as far from traffic as you can before you stop. Driving on a failed tire ruins the wheel and risks control.
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13. You want to turn left across the oncoming lane into a shopping center driveway. Who must you yield to?
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Answer B: Oncoming traffic and anyone using the sidewalk
A left turn into a driveway crosses both the oncoming lane and the sidewalk, so you give way to traffic and to pedestrians before completing it.
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14. In a work zone the temporary lane lines conflict with the old lines still visible on the pavement. Which do you follow?
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Answer C: The temporary markings, which show the current traffic pattern
Temporary markings define the traffic pattern in force, and the old lines are simply the layout that no longer applies.
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15. Which Iowa passenger must ride in a rear-facing child restraint system?
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Answer B: A child under one year of age who also weighs less than twenty pounds
Iowa Code section 321.446 requires a rear-facing child restraint system for a child who is under one year of age and weighs less than twenty pounds.
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16. The gates at a railroad crossing begin to come down as you approach. What must you do?
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Answer A: Stop and wait until the gates are fully raised and the lights stop flashing
Once the gates start down you must stop clear of the tracks and wait until they are fully raised and the warning lights have stopped.
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17. The car ahead drifts across the lane line and back again several times. What should you do?
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Answer C: Assume that the driver is distracted or impaired, and keep well back
Drifting is a classic sign of a distracted, drowsy or impaired driver, and distance is your protection from all three.
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18. Why does the speed of the right-hand lane of a freeway change so often?
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Answer B: Vehicles entering and leaving the highway all use that lane
Entrance and exit ramps feed into the right lane, so traffic there is constantly slowing to leave or speeding up to join.
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19. Besides alcohol, what else makes a driver guilty of operating while intoxicated under Iowa law?
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Answer A: Any amount of a controlled substance present in the blood or urine
Iowa Code section 321J.2 makes it an offense to operate a motor vehicle while any amount of a controlled substance is present in the person, as measured in the blood or urine.
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20. What is the only reliable remedy for a driver who is sleepy?
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Answer A: Sleep
Caffeine, fresh air and noise may make you feel alert for a few minutes, but they do not remove the need for sleep. Stop somewhere safe and rest.
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21. You have signaled and pulled up level with the car in front of an empty curb space. What comes next?
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Answer A: Reverse slowly while turning the wheel toward the curb
From alongside the forward car you back in on a turn toward the curb, then straighten and swing the front in as the rear reaches the space.
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22. What administrative fee does an Iowa county treasurer charge to issue new plates after an insurance violation is resolved?
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Answer B: Fifteen dollars
Iowa Code section 321.20B requires the owner to pay a fifteen dollar administrative fee to the county treasurer, who then issues new license plates and registration.
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23. After completing a turn you notice your signal is still flashing. What should you do?
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Answer A: Switch it off at once, before other drivers act on it
A signal left on after a turn is a false message, and drivers waiting to pull out may move into your path because of it.
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24. What actually lowers the amount of alcohol in a person's blood?
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Answer D: The passage of time
The body eliminates alcohol at its own steady rate, so only time reduces blood alcohol. Coffee or a cold shower may make a person feel more awake while still impaired.
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25. A white arrow painted in your lane points only to the right, and a sign above the lane shows the same movement. What must you do?
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Answer C: Turn right from that lane
Pavement arrows used with lane-use signs are regulatory, so a driver occupying that lane must make the movement shown.