Iowa: Interstate driving Practice Test
The parts of an interstate on-ramp, merging into traffic, and making room for vehicles entering the highway.
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Questions are original and based on the official manual "Iowa Driver’s License Manual" (July 2026), Iowa Department of Transportation.
All 5 questions in this practice test
Take the test above first, then use this list to study. Tap “Show answer” to see the correct answer and explanation.
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How many segments does an interstate or highway on-ramp contain?
- Two
- Four
- Five
- Three
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Correct answer: Three
The manual says on-ramps are used to enter an interstate or highway and contain three segments.
Source: Iowa Driver’s License Manual (July 2026), page 51
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What is the purpose of the entrance area of an on-ramp?
- It gives you time to scan the roadway and judge the space and speed needed
- It is where you should come to a stop and then wait for a gap in traffic
- It is where you should merge into the interstate traffic lane at once
- It is where traffic already on the interstate is required to slow down
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Correct answer: It gives you time to scan the roadway and judge the space and speed needed
The entrance area gives you time to scan the roadway and evaluate how much space you have to enter and what speed is needed.
Source: Iowa Driver’s License Manual (July 2026), page 51
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What should you do in the acceleration and merge area of an on-ramp?
- Slow below the speed of traffic and wait for a long gap
- Stop at the end of the ramp and signal
- Bring your vehicle up to the speed of traffic and merge when safe
- Drive at a steady speed and use the shoulder to merge
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Correct answer: Bring your vehicle up to the speed of traffic and merge when safe
Use the acceleration and merge area to bring your vehicle up to the speed of traffic and merge when it is safe.
Source: Iowa Driver’s License Manual (July 2026), page 51
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When should you completely stop on an interstate on-ramp?
- Only when it is absolutely necessary
- Whenever traffic is moving on the interstate
- Every time before you merge
- When the ramp has a curve
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Correct answer: Only when it is absolutely necessary
The manual says not to completely stop on the ramp unless absolutely necessary.
Source: Iowa Driver’s License Manual (July 2026), page 51
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What should traffic already on an interstate or highway do to allow ramp traffic to enter?
- Keep the same lane and speed so ramp drivers can adjust
- Brake hard and stop in the travel lane
- Move over, slow down, or speed up
- Move onto the shoulder until the ramp traffic has merged
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Correct answer: Move over, slow down, or speed up
The manual says traffic already on the interstate or highway should move over, slow down, or speed up to allow ramp traffic to enter.
Source: Iowa Driver’s License Manual (July 2026), page 51