Iowa Car / Permit practice
Iowa Car / Permit: Speed & Space Management practice test
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
Content reviewed against official driver handbooks · August 12, 2026
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
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Study questions with answers
12 sample Speed & Space Management questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. At speeds around 40 mph, what following distance does the Iowa manual recommend?
Correct answer: Four to five seconds
The manual advises stretching the gap to four or five seconds once you reach roughly 40 mph.
Source: Iowa Driver's License Manual — Chapter 4, Safe Following Distance
2. According to the stopping-distance figures in the Iowa manual, roughly how far does a vehicle travel at 60 mph from the moment a hazard appears until it halts?
Correct answer: About 359 feet
At 60 mph the manual adds 132 feet of reaction distance to 227 feet of braking distance, for a total of about 359 feet.
Source: Iowa Driver's License Manual — Chapter 4, Braking and Stopping
3. What minimum speed applies on the Iowa interstate system?
Correct answer: 40 mph
Interstates carry a floor of 40 mph, and any vehicle unable to sustain that under normal conditions is not permitted on them.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
4. What following distance does the Iowa manual set as a minimum for a beginning driver in normal conditions?
Correct answer: Three seconds
A new driver should hold at least three seconds of space; an experienced driver may find two seconds adequate when conditions are good.
Source: Iowa Driver's License Manual — Chapter 4, Safe Following Distance
5. Where no sign is posted, what general speed limit applies in an Iowa suburban district?
Correct answer: 45 mph
Suburban districts carry a default limit of 45 mph when nothing else is posted.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
6. What is the general speed limit on Iowa's rural interstate highways?
Correct answer: 70 mph
Rural stretches of interstate carry a limit of 70 mph, the highest figure the manual lists.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
7. Rain has made the pavement wet. How much following distance does the Iowa manual suggest?
Correct answer: Five to six seconds
On wet roads you should drive below your usual speed and open the gap to five or six seconds.
Source: Iowa Driver's License Manual — Chapter 5, Wet/Slippery Roads
8. Absent a posted sign, what limit applies on Iowa primary roads and urban interstate highways?
Correct answer: 60 mph
Primary roads, urban interstates, and secondary roads including unpaved ones carry a 60 mph limit from sunrise to sunset.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
9. With no sign posted, what is the general speed limit in an Iowa residential or school district?
Correct answer: 25 mph
The default figure for residential and school districts is 25 mph.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
10. The road is slippery, or the vehicle ahead blocks your view of the road. What following distance is recommended?
Correct answer: Six seconds or more
Under those conditions the manual calls for six seconds or more of space.
Source: Iowa Driver's License Manual — Chapter 4, Safe Following Distance
11. Compared with a vehicle doing 30 mph, how much farther does a vehicle at 60 mph travel before it can stop?
Correct answer: About three times as far
The manual uses this comparison to show that doubling speed more than doubles the distance: the faster vehicle needs roughly three times the room.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
12. Where no limit is posted, how fast may a vehicle towing another vehicle travel in Iowa?
Correct answer: 45 mph
The general limit set for any vehicle pulling another vehicle is 45 mph.
Source: Iowa Driver's License Manual — Chapter 4, Appropriate Speed
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