Iowa DOT Permit Practice Test 2026：第3套练习测试

Iowa DOT Permit Practice Test 练习测试第3套（共8套）：再练25道题，附答案和解释。

驾驶
艾奥瓦州
205道题
核对于2026年10月10日

第1题，共25题
What does this sign mean?
- Detour to the right
- Right turns only
- Traffic on this street moves only in the direction of the arrow
- Keep to the right of the divider
显示答案
答案: C. Traffic on this street moves only in the direction of the arrow
Drive only in the direction of the arrow. You may not drive the other way on a one-way street.
第2题，共25题
On a freeway with two or more lanes going your way, what is the left lane mainly for?
- Stopping in an emergency
- Passing
- Slow vehicles
- Trucks only
显示答案
答案: B. Passing
Keep right except to pass. If many vehicles pass you on the right, move right and let them go by on the left.
第3题，共25题
What does a white diamond painted in a lane mean?
- The lane is for trucks only
- The lane is reserved for buses, carpools or other special vehicles
- There is a railroad crossing ahead
- The lane ends soon
显示答案
答案: B. The lane is reserved for buses, carpools or other special vehicles
A diamond marks a high-occupancy vehicle (HOV) or other reserved lane. Signs tell you who may use it and when.
第4题，共25题
What does a five-sided (pentagon) sign like this warn you about?
- A no-passing zone
- A railroad crossing
- Road work
- A school zone or school crossing
显示答案
答案: D. A school zone or school crossing
The pentagon shape is used for school signs, so you know to watch for children.
第5题，共25题
What should you do when you see this sign?
- Pass the car in front before you reach the crosswalk
- Honk to warn the children
- Slow down, watch for children, and stop for anyone in the crosswalk
- Speed up to get past the crosswalk quickly
显示答案
答案: C. Slow down, watch for children, and stop for anyone in the crosswalk
The arrow points to the school crosswalk. Stop for children in the crosswalk and follow any crossing guard. Never pass a vehicle stopped for pedestrians.
第6题，共25题
When is it right to use your horn?
- To warn others of danger or to help avoid a crash
- To greet friends as you drive by
- To show you are angry
- To tell a slow driver to hurry up
显示答案
答案: A. To warn others of danger or to help avoid a crash
Use your horn to let others know you are there or to warn them of a hazard, not to express anger.
第7题，共25题
Zones 1 and 2 are this car's blind spots. Before you change lanes, how should you check them?
- Honk and move over slowly
- Turn your head and look over your shoulder
- Use only the inside rearview mirror
- Use only the side mirrors
显示答案
答案: B. Turn your head and look over your shoulder
Mirrors do not show every area beside you. Look over your shoulder to check the blind spot before you move.
第8题，共25题
You park facing uphill next to a curb. Which way should you turn your front wheels?
- Toward the curb
- Away from the curb, so the tire rests against the curb if the car rolls back
- It does not matter if the parking brake is set
- Straight ahead
显示答案
答案: B. Away from the curb, so the tire rests against the curb if the car rolls back
Uphill with a curb, turn your wheels toward the center of the road and let the front tire gently touch the curb.
第9题，共25题
What does this sign mean?
- The road becomes divided
- A narrow bridge is ahead
- A new lane is added
- The right lane ends; merge left when it is safe
显示答案
答案: D. The right lane ends; merge left when it is safe
If you are in the lane that ends, signal and move over when there is a safe gap. Drivers in the other lane should help by adjusting speed.
第10题，共25题
A common cause of serious motorcycle crashes is a driver who:
- Turns left in front of an oncoming motorcycle
- Parks next to a motorcycle
- Follows a motorcycle at a safe distance
- Passes a motorcycle on a straight road
显示答案
答案: A. Turns left in front of an oncoming motorcycle
Drivers turning left often fail to see oncoming motorcycles. Look carefully for motorcycles before you turn.
第11题，共25题
The school bus ahead of you turns on flashing yellow (amber) lights. What does this mean?
- The bus is getting ready to stop, so slow down and prepare to stop
- The bus has broken down
- You should pass the bus quickly
- The children have finished crossing
显示答案
答案: A. The bus is getting ready to stop, so slow down and prepare to stop
Flashing yellow lights on a school bus warn that it will soon stop and turn on its red lights.
第12题，共25题
When is the road often most slippery in the rain?
- In the first minutes after rain starts
- Just after the rain stops and the sun comes out
- After it has rained for many hours
- Only at night
显示答案
答案: A. In the first minutes after rain starts
When rain begins, it mixes with oil and dirt on the road and makes a slick film. Slow down right away.
第13题，共25题
What does this sign mean?
- A four-way intersection
- A railroad crossing; yield to any train
- You must always stop here, even when no train is near
- A hospital is nearby
显示答案
答案: B. A railroad crossing; yield to any train
Treat a crossbuck like a yield sign. Slow down, look and listen both ways, and stop if a train is coming. Trains always have the right-of-way.
第14题，共25题
Which of these is distracted driving?
- Scanning the road ahead
- Eating or changing the music while driving
- Keeping both hands on the wheel
- Checking your mirrors
显示答案
答案: B. Eating or changing the music while driving
Any activity that takes your attention from driving is a distraction, including eating, talking and adjusting the stereo or GPS.
第15题，共25题
What does a steady yellow light mean?
- Speed up to get through before it turns red
- The light is about to turn red, so stop if you can do it safely
- Only pedestrians may move now
- The intersection is clear, so go
显示答案
答案: B. The light is about to turn red, so stop if you can do it safely
A steady yellow light warns that the green is ending and red is coming. Stop if you can do so safely.
第16题，共25题
Compared with a sober driver, about how much more likely is a driver with a BAC of 0.08% to crash?
- About 20 times
- About the same
- About 4 times
- About 1.5 times
显示答案
答案: C. About 4 times
Drivers at a BAC of 0.08% are about four times more likely to crash than drivers with no alcohol.
第17题，共25题
Car A and Car B reach this intersection, which has no signs or signals, at about the same time. Which car must yield?
- Whichever car is going faster
- Car B
- Neither car; both may go at once
- Car A
显示答案
答案: D. Car A
At an uncontrolled intersection, if two cars arrive together, the driver on the left yields to the driver on the right. Car B is on Car A's right, so Car A must yield.
第18题，共25题
Why should you never drive beside a motorcycle in the same lane?
- Motorcycles must ride on the shoulder
- A motorcyclist has the right to use the full width of the lane
- Motorcycles are always slower than cars
- It is fine if the rider waves you by
显示答案
答案: B. A motorcyclist has the right to use the full width of the lane
A motorcycle is entitled to a full lane, just like a car. Sharing its lane is dangerous and not allowed.
第19题，共25题
What does this sign mean?
- Trucks cross the road ahead
- An uphill passing lane is ahead
- A steep downhill grade is ahead; slow down and use a lower gear
- A truck stop is ahead
显示答案
答案: C. A steep downhill grade is ahead; slow down and use a lower gear
On a steep downgrade, slow down before the hill and shift to a lower gear so your brakes do not overheat.
第20题，共25题
What is hydroplaning?
- When a tire slowly loses air
- When water gets into your engine
- When your tires ride on a layer of water and lose contact with the road
- When your brakes overheat on a long hill
显示答案
答案: C. When your tires ride on a layer of water and lose contact with the road
At higher speeds on wet roads, tires can ride up on water. You then lose steering and braking control.
第21题，共25题
What does this sign mean?
- Always come to a full stop
- The road narrows ahead
- Merge without slowing down
- Slow down and let traffic and pedestrians go first; stop if needed
显示答案
答案: D. Slow down and let traffic and pedestrians go first; stop if needed
A triangle pointing down means yield. Slow down, give the right-of-way, and stop only if you must.
第22题，共25题
On a divided highway, what color is the edge line on the left side of your lanes?
- Red
- White
- Yellow
- Blue
显示答案
答案: C. Yellow
Yellow marks the left edge of divided highways, one-way streets and ramps. White marks the right edge.
第23题，共25题
Why should you avoid making a U-turn near the top of a hill or on a curve?
- It wears out your tires
- Your turn signal will not work
- It uses too much fuel
- Other drivers may not see you in time to stop
显示答案
答案: D. Other drivers may not see you in time to stop
U-turns are unsafe where other drivers cannot see your vehicle from far away, such as near hilltops and curves.
第24题，共25题
Where should you stop at this sign if there is a crosswalk but no stop line?
- After the crosswalk, at the edge of the cross street
- Inside the intersection, where you can see best
- Before the crosswalk
- In the middle of the crosswalk
显示答案
答案: C. Before the crosswalk
Stop at the stop line. If there is no line, stop before the crosswalk. If there is no crosswalk, stop before you enter the intersection.
第25题，共25题
A pedestrian with a white cane or a guide dog is waiting to cross. What should you do?
- Stop and let the person cross, without honking
- Wave the person across from far away
- Honk so the person knows you are there
- Drive around the person
显示答案
答案: A. Stop and let the person cross, without honking
Pedestrians who use white canes or guide dogs have the right-of-way. Do not honk at a blind pedestrian.

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