Iowa DMV Permit Practice Test

The Iowa DOT knowledge test is the first gate to your instruction permit. The Iowa Driver's Manual is the best place to start studying, and the Iowa DOT can confirm the current passing score. Study systematically rather than skimming the night before.

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  Knowledge test — 80% to passThere is no separate under-18 test — the same operator's knowledge test applies to all applicants. Study topics include road signs, traffic laws, safe driving practices, vehicle maintenance, sharing the road, and driving under the influence.
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  Minimum age to apply — 14Iowa allows instruction permit applications at age 14. You must pass the knowledge test, a vision screening, and provide parental or guardian consent.
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  Application fee — $6The instruction permit fee is $6.
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  Bring with youProof of identity (birth certificate or passport), your Social Security number, proof of Iowa residency, and parental or guardian consent if you are under 18. All documents must be originals or certified copies.
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  Under-18? Driver education is requiredIowa requires applicants under 18 to complete a state-approved driver education course — at least 30 classroom hours plus 6 or more hours of lab instruction, including at least 3 hours of street or highway driving. It is required for the intermediate license, not for the instruction permit.
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  Cover the rules, not just signsThe handbook covers traffic laws in detail. Don't focus only on signs — use this guide to cover the rules too.
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  Retake policyIf you fail, retesting is at the examiner's discretion. Ask the examiner when you can retake the test.

The handbook covers traffic laws and safety in detail. Master intersection rules, following distance, and alcohol limits first — then layer in road signs and vehicle rules.

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  Road signsLearn signs by shape and color first. Yellow diamond signs warn of upcoming hazards. White rectangular signs are regulatory. Round signs mean railroad crossing ahead. Pentagonal signs indicate school zones.
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  Right-of-way and turningThe first vehicle to arrive at a four-way stop goes first, and if two arrive simultaneously, the driver on your right goes first. At an uncontrolled intersection, the same rule applies: yield to the driver on your right. When turning left, yield to all oncoming traffic and to pedestrians.
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  Signal distance — 100 feet (or 300 feet above 45 mph)Iowa law requires a continuous signal for at least 100 feet before any turn in areas with a speed limit of 45 mph or less. If the speed limit is above 45 mph, signal at least 300 feet before the turn. Signal before a lane change too, but Iowa sets no minimum distance for that. Know both thresholds.
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  Railroad crossing — stop no closer than 15 feetStop with at least 15 feet between your vehicle and the nearest rail whenever signals are flashing, gates are down, a flagger signals, or a stop sign is posted. Never drive around lowered crossing gates. Once a train has passed, wait for every gate to lift before proceeding.
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  Following distance — 2 seconds (4-5 seconds above 40 mph)Under ideal conditions below 40 mph, experienced drivers need at least 2 seconds of following distance; inexperienced drivers need at least 3 seconds. Above 40 mph, increase to 4 to 5 seconds. Increase further in any conditions that are less than ideal.
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  BAC limit (21+) — 0.08%Drivers who are 21 or older break the law if their blood alcohol concentration is 0.08% or higher while operating a motor vehicle. That is the per-se limit, but you can be impaired at lower levels and still face OWI charges based on observed behavior.
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  Impairment begins before the legal limitAny amount of alcohol affects driving. Only the passage of time lowers BAC; coffee, exercise, and food do nothing.
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  Chemical test refusal — 1-year revocationUnder Iowa's Implied Consent Law, any officer who suspects impairment may require a breath, urine, or blood test. If you refuse, your license is revoked for one year; if you take the test and fail, it is revoked for 180 days (both are first-revocation periods). The officer may take your license on the spot and issue a 10-day temporary license. This applies to both resident and non-resident drivers.
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  School bus — stop when red lights flashIf a school bus has its red lights flashing and its stop arm extended, stop at least 15 feet away and do not go until the lights stop and the arm retracts. You are not required to stop for a bus traveling the opposite direction on a highway with two or more lanes in each direction.
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  Passing prohibited within 100 feet of intersections and railroad crossingsIowa law prohibits passing within 100 feet of a railroad crossing or intersection. Also prohibited: passing on a hill, in a curve, or anywhere your line of sight is blocked.

These rules are easy to confuse. They share a pattern: the wrong answer is close enough to feel right on a quick read. Slow down on every question in this section.

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  Right-of-way at intersectionsAt a four-way stop when two vehicles arrive simultaneously, yield to the driver on your right. At an uncontrolled intersection with simultaneous arrival, same rule — right has right-of-way. If traffic signals are out, treat the intersection as an all-way stop.
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  School bus rules — two-lanes-each-way exceptionOn a road with three lanes or fewer, including a two-lane road with a center turn lane, all traffic in both directions must stop for a school bus loading or unloading students. On a highway with two or more lanes in each direction, drivers on the opposite side do not have to stop. Know the distinction.
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  Hill parking — downhillFacing downhill, with or without a curb, point your front wheels at the curb or the roadside edge. Should the brakes fail, the vehicle rolls toward the shoulder instead of into traffic. This parking rule is easy to mix up.
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  Hill parking — uphill with a curbWhen you park facing uphill next to a curb, turn the front wheels away from the curb, sharply left. If the brakes fail, the vehicle rolls back into the curb rather than into traffic. With no curb, facing uphill, turn the wheels toward the edge of the road, same as downhill.
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  Impairment vs. legal limit0.08% is the arrest threshold — not the point where impairment begins. Any amount of alcohol affects judgment and reaction time. Don't assume you're safe to drive below 0.08%.
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  Watch 'always' and 'never'Be careful with 'always' and 'never' in answer options, and check whether they genuinely apply. One genuine absolute: always yield to a pedestrian carrying a white cane or guided by a dog, with no exceptions.
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  Bicycle and pedestrian right-of-wayWhen turning left, yield to oncoming traffic AND to bicyclists and pedestrians. At a green light, yield to any pedestrian already in the intersection, even one crossing against the 'Don't Walk' signal. Bicyclists have the same rights as vehicles on Iowa roads.

Reading the handbook once is rarely enough to pass. A simple routine works: read once, drill once, listen once. That's the whole system.

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  Loop 1 — read the Iowa Driver's ManualDownload the Iowa Driver's Manual free from iowadot.gov. Read through once without stopping to memorize. You're building a map of what exists, not trying to absorb every rule on the first pass.
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  Loop 2 — drill the practice examsTake the free 40-Q exam on this page cold. Anything under 32 out of 40 — identify the weak categories and retake. The practice questions cover traffic laws, safety, drugs/alcohol, vehicle rules, road signs, and parking.
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  Loop 3 — listen along on YouTubeWatch the Iowa DMV Practice Test video the night before your test. Hearing the questions and answers read aloud locks in recall through a second memory channel — especially useful for sign rules you haven't fully visualized yet.
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  Sleep beats crammingMemory consolidates overnight. A full night's sleep before the test is worth more than two extra hours of late-night reading. If you've done loops 1 and 2, you're ready — rest is the third ingredient.
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  Study signs visually, not verballyDon't just read sign descriptions in the manual. Look at the actual shape, color, and symbols. A round sign means railroad crossing; a pentagon means school zone. Burn those shapes into memory, not just the words.
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  Read every option before you answerRead to the last option before you choose. If 'All of the above' is offered, check that every option fits before you pick it, and don't answer on reflex.

Passing the knowledge test earns you an Iowa instruction permit — not a full license. Iowa's GDL rules call for 20 hours of supervised driving on the permit and 10 more on the intermediate license. The 12:30 AM curfew applies to the intermediate license, and the passenger restriction covers the first 6 months of the intermediate license.

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  Permit supervision — licensed driver requiredAll driving on the instruction permit must be supervised by a parent or guardian, a family member age 21 or older, a driver education instructor, or another authorized driver age 25 or older with parental permission. The supervisor must be in the vehicle at all times.
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  Minimum permit hold — 12 monthsYou must hold your instruction permit for at least 12 months before you can apply for an intermediate license, and be accident- and violation-free for the 6 months right before you apply.
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  Supervised hours — 20 on permit (2 at night)Iowa requires a minimum of 20 hours of supervised driving on the instruction permit, including at least 2 hours between sunset and sunrise. A parent, guardian, or custodian signs an affidavit of those hours when you apply for the intermediate license.
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  Additional supervised hours — 10 more on intermediate licenseAfter receiving your intermediate license, Iowa requires an additional 10 hours of supervised driving before you become eligible for a full license. Total supervised requirement across both stages: 30 hours.
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  Curfew — 12:30 AM to 5:00 AMThe 12:30 AM to 5:00 AM curfew applies to the intermediate license, not the instruction permit. Exceptions are driving to and from school-related extracurricular activities and work, with a parent-signed waiver form. No general recreational exception.
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  Passenger restriction — first 6 months of intermediate licenseDuring the first 6 months of the intermediate license, you may carry a maximum of 1 unrelated minor passenger (under 18, not a sibling, stepsibling, or household member). After 6 months, the restriction lifts automatically.
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  When restrictions lift — age 17 via GDL, or 18 withoutFull driving privileges are available at age 17 if you have completed the full GDL path (instruction permit → 12-month hold → intermediate license → 12 consecutive violation-free months). Without the GDL path, full license eligibility is age 18.