Missouri DOR Permit Practice Test 39
- Questions25
- Correct to pass20
- Passing score80%
- Minimum age15 years
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1. A sign on a long descent points to a RUNAWAY TRUCK RAMP a mile ahead. What is that ramp for?
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Answer C: Stopping a vehicle whose brakes have failed
An escape ramp climbs into deep gravel or sand to bring a vehicle with failed brakes to a halt, so no one should stop or park in it.
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2. Besides school signing, which warning signs may also use a fluorescent yellow-green background?
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Answer C: Pedestrian and bicycle warning signs
Pedestrian crossing, bicycle and playground warning signs may use either the standard yellow or the fluorescent yellow-green background, which draws extra attention where people outside vehicles are present.
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3. Why does a heavier vehicle need more room to stop than a light one from the same speed?
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Answer B: Because there is more mass in motion for the tires to slow down
More mass means more energy at the same speed, and the brakes and tires need more distance to get rid of it.
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4. 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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5. A driver leaves the vehicle at the curb where this sign is posted and walks away for two minutes. Is that allowed?
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Answer B: No, leaving the vehicle unattended there is prohibited whatever the length of the absence
Walking away leaves the vehicle parked, and the prohibition holds regardless of how long the driver is gone or whether the engine is left running.
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6. You are stopped at a red light ready to turn right when a person pushing a stroller steps into the crosswalk. What should you do?
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Answer A: Stay stopped until they have crossed your path
A turn on red gives way to every pedestrian in the crosswalk, and someone pushing a stroller has even less room to react.
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7. 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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8. What does this sign warn a driver about?
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Answer A: Traffic from another roadway will enter the same lane ahead
Two traffic streams come together into one lane beyond this point, so drivers on both roadways have to adjust speed and spacing to fit together.
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9. What does a tire with worn tread do on a wet road?
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Answer B: It loses grip and it hydroplanes at a lower speed than a good tire
Tread grooves carry water away from the contact patch, and a worn tire cannot do that, so it floats on the water sooner.
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10. Where is passing prohibited even when no line is visible?
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Answer D: On a curve or near the crest of a hill, at intersections and at railroad crossings
Passing is prohibited wherever your view of oncoming traffic is blocked or where vehicles may cross your path, which includes hills, curves, intersections and rail crossings.
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11. The accelerator sticks open while you are driving. What is the first thing to do?
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Answer A: Shift into neutral and brake while steering off the road
Neutral disconnects the engine from the wheels so the vehicle can be braked normally, while shutting off the ignition may lock the steering and remove power assistance.
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12. You have to leave a trailer parked on a slope. What extra step protects it?
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Answer D: Chock the trailer wheels as well as setting the brake
Chocks physically block the wheels, which is the only thing that still holds if a brake or a coupling lets go.
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13. Warning signs such as stop ahead, yield ahead and signal ahead are installed mainly where
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Answer B: the traffic control device cannot be seen from far enough away
These advance warning signs are used when a crest, curve or obstruction keeps the stop sign, yield sign or signal from coming into view in time for a driver to react.
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14. You are backing a trailer and want its rear to move to the left. Which way should you turn the steering wheel?
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Answer A: Move the bottom of the wheel to the left, which turns the top to the right
A trailer moves opposite to the tow vehicle's steering when backing. Holding the wheel at the bottom and moving your hand in the direction you want the trailer to go makes this easier.
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15. A lane along the right edge is set off by a solid white line and marked with a bicycle symbol. How should a driver treat it?
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Answer B: Stay out of it except for the short distance needed to turn or cross where that is allowed
A marked bicycle lane is set aside for bicycle traffic, and motor vehicles may enter it only briefly where turning or crossing is permitted.
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16. Red pavement markings are used on a roadway to show that
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Answer A: it must not be entered from that direction
Red markings identify a roadway that is not to be entered or used, and they also mark the pavement of truck escape ramps.
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17. A sign warns that the right lane ends ahead, and traffic is still flowing freely. What should you do if you are in that lane?
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Answer C: Signal, adjust your speed and move left in good time before the lane ends
When traffic is moving freely there is room to merge early and smoothly, which avoids the last-second lane change at the closure point.
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18. Loose items slide around your car and rattle every time you brake. What is the answer?
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Answer C: Secure them before you start driving
Sliding objects pull your attention and can roll under the pedals, so stow them in the trunk or wedge them before the trip rather than chasing them during it.
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19. Why are eating, drinking and personal grooming risky behind the wheel?
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Answer B: They occupy hands, eyes and attention that driving requires
Each of these tasks takes a hand off the controls and attention off the road, and a spill or a dropped item can pull the driver's eyes away entirely.
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20. Where does the restriction that starts at this sign come to an end?
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Answer D: Where the centerline markings show that overtaking is allowed again
The sign marks the start of the restricted section, and the centerline markings along the road show how far it runs and where overtaking becomes lawful again.
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21. How much should you normally reduce your speed on a road covered with packed snow compared with dry conditions?
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Answer C: By about half
Packed snow roughly doubles the distance needed to stop, so a common guideline is to cut speed by about half. On ice, slow to a crawl.
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22. You are leaving a freeway at an exit that has a deceleration lane. Where should you slow down?
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Answer C: After you have moved fully into the exit lane
Braking in a through lane surprises the traffic behind you, so you move into the exit lane at highway speed and then slow down inside it.
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23. In Missouri, when do you not have to stop for a school bus with its red lights flashing?
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Answer A: When you are traveling the opposite direction on a highway with four or more lanes of traffic
Missouri exempts drivers traveling the opposite direction on a highway with four or more lanes, on a highway divided by a median with separate roadways, or when the bus is in a school loading zone where students do not cross.
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24. In heavy fog at night on a rural two-lane road, which marking best helps a driver hold position?
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Answer C: The solid white line along the right edge
Steering by the right edge line keeps a driver clear of oncoming traffic, while watching the center line tends to pull the vehicle toward it.
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25. Why is repeatedly changing lanes to work through heavy traffic a poor idea?
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Answer A: It raises the crash risk and saves almost no time
Each lane change adds a conflict with another vehicle, and in congestion the lanes move at similar average speeds, so the gain is negligible.