Missouri DOR Permit Practice Test 46
- Questions25
- Correct to pass20
- Passing score80%
- Minimum age15 years
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1. In slow summer traffic the temperature gauge climbs into the red. What should you do first?
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Answer A: Turn off the air conditioner and turn on the heater to draw heat from the engine
The heater core acts as an extra radiator, and shutting off the air conditioner reduces engine load. If the gauge keeps climbing, pull over and shut off the engine, and never open a hot radiator cap.
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2. Rain is falling and the outside temperature reads close to 32 degrees Fahrenheit. Why is that dangerous?
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Answer A: The rain can freeze on contact and glaze the road with ice
Near freezing, rain landing on cold pavement can turn to a glaze of ice almost at once, so a road that looks merely wet may have no grip at all.
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3. A wide solid white line separates the through lanes from an exit lane. What does it tell drivers?
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Answer B: The choice of lane should already have been made
A channelizing line marks where the paths separate and crossing it is discouraged or prohibited, so the lane change has to happen upstream.
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4. After the first six months with a Missouri intermediate license, what is the passenger limit for people under 19 who are not immediate family?
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Answer C: No more than three
After the first six months the limit rises to three passengers under 19 who are not members of the driver's immediate family.
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5. Why can an oncoming vehicle that looks comfortably far away leave you far less room than you expect?
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Answer D: You and that vehicle close the gap at the sum of both your speeds
Two vehicles approaching at 55 mph each close the distance between them at about 110 mph, so the gap disappears in half the time you would expect.
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6. You are crossing a divided highway with a wide median. How should you treat the two roadways?
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Answer D: As two intersections, waiting in the median only when your vehicle fits
Each roadway of a divided highway is a separate intersection, and you should wait in the median only if it is long enough to hold your vehicle clear of both roadways.
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7. Beyond the point this sign refers to, which movement becomes unlawful?
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Answer D: Driving on the far side of the separation, against the flow
Once the two directions are separated, each roadway carries one-way traffic, so crossing to the other side means driving into oncoming vehicles.
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8. A speed limit sign carries a second panel reading TRUCKS 55. What does that panel do?
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Answer B: It sets a lower legal limit for trucks
A truck speed limit panel is regulatory, so trucks are bound by the lower figure while other traffic keeps to the main limit.
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9. What change in the road does this sign announce?
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Answer B: The two directions of travel are about to be separated, and the driver must keep to the right of the separation
Ahead the roadway splits into separate one-way roadways on either side of a median, so the driver stays to the right of the divider and no longer meets oncoming vehicles.
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10. A train has just passed a crossing that carries more than one set of tracks. What should you do?
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Answer B: Wait until the warning devices stop and you can see clearly along every track
A passing train can hide a second one coming on another track, so wait for the signals to clear and check each track before moving.
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11. You are passing a large truck on an open highway in a strong crosswind. What should you expect?
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Answer A: A push toward the truck, then a push the other way as you clear it
The truck shelters you as you go by and then releases you into the full gust, so the load on the steering changes twice during the pass.
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12. 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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13. You have strapped luggage to the roof rack for a long trip. What should you expect?
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Answer D: A higher center of gravity, so take the curves and lane changes gently
Weight on the roof raises the center of gravity and makes the vehicle lean and respond more slowly to steering.
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14. A center lane is bordered by a solid yellow line on the outside and a broken yellow line on the inside, with turn arrows painted inside it. What is that lane for?
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Answer C: Left turns made by traffic traveling in either direction
That marking pattern identifies a two-way left-turn lane, which drivers approaching from both directions may use to prepare for a left turn.
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15. What must a Missouri driver provide to be reinstated after an intoxication-related suspension?
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Answer A: A $45 fee, proof of SATOP and two years of SR-22 insurance
Missouri requires a $45 reinstatement fee, completion of a Substance Awareness Traffic Offender Program, and an SR-22 filing kept on file for two years.
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16. Why are drivers required to turn the front wheels when parking on a grade?
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Answer A: So that a vehicle that starts to roll leaves the traffic lanes instead of entering them
The wheel position is a last line of defense if the parking brake or transmission fails, directing the vehicle into the curb or off the roadway.
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17. 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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18. When are the hazard warning lights properly used?
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Answer A: When your vehicle is stopped or barely moving and is a hazard
Hazard lights warn that your vehicle is an obstruction; they do not authorize illegal parking and they hide your turn signals while driving.
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19. Do hazard lights make it legal to leave your vehicle in a no parking zone?
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Answer A: No, they warn other drivers but do not permit the parking
Hazard lights are a warning device, not a permit; the parking restriction applies whether they are flashing or not.
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20. A yellow diamond on an exit ramp shows a truck tipping over onto two wheels. Which drivers does it concern most?
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Answer D: Those in tall vehicles carrying a high load
The truck rollover sign warns that the curve can overturn a vehicle with a high center of gravity, so such drivers must slow well below the normal ramp speed.
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21. You reach a one-lane bridge and a vehicle is already partway across it coming toward you. What should you do?
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Answer D: Stop before the bridge and let it come through
A vehicle already on a one-lane bridge has the right of way, and the driver who has not yet entered waits at the approach.
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22. Federal law lets a state open its high-occupancy vehicle lanes to certain vehicles carrying only one person. Which of these is covered by that allowance?
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Answer B: Motorcycles
Federal law lets states allow motorcycles into high-occupancy vehicle lanes regardless of the number of occupants, because keeping riders in the flow is safer than the alternative.
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23. Why is backing up on a freeway or on its shoulder prohibited?
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Answer A: Traffic arrives far too fast to expect a vehicle moving the wrong way
Freeway traffic closes on a stopped or reversing vehicle at highway speed and has almost no time to react to something moving against the flow.
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24. A vehicle in front of you has already begun turning left into a driveway when the gap you were waiting for opens up. What should you do?
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Answer B: Wait and let that driver finish the turn
A vehicle that has lawfully started a maneuver keeps the right of way until it is finished.
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25. Where in Missouri is an emissions inspection required?
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Answer B: St. Louis City and four surrounding counties
Emissions inspections apply in St. Louis City and in St. Louis, St. Charles, Franklin and Jefferson counties under the Gateway Vehicle Inspection Program.