Iowa Permit Test Study Guide (2026)

Cover every topic on the Iowa DMV permit test, ranked by how often they show up on the real exam.

The Iowa Driver's Manual is the only source the DOT uses for test questions. You can read it free as a PDF on iowadot.gov. Cover every chapter. Pay close attention to signs, signals, right of way, parking, and the laws on alcohol and drugs. The DOT also posts a free practice test that pulls from the real test bank.

Iowa Speed Limits

Speed limits are one of the most-tested topics on the IA permit exam, and the questions usually test Iowa's statutory default limits -- what the speed is when no sign is posted. Under Iowa Code 321.285, Iowa's defaults are 20 mph in a business district, 25 mph in a residence or school district, and 45 mph in a suburban district. Always obey the basic-speed law: never drive faster than is safe for current conditions.

Alcohol & BAC Limits

Expect at least one alcohol question on the Iowa permit test. Memorize the three BAC thresholds: 0.08% is the legal limit for drivers age 21 and older, 0.04% is the limit for anyone driving with a commercial driver license (CDL), and Iowa's zero-tolerance threshold for drivers under 21 is 0.02% (Iowa Code 321J.2A). A first violation brings a 60-day license revocation (1 year if you refuse testing), and you can't get a temporary restricted license during that revocation. A BAC of 0.08% or higher brings full adult OWI charges instead.

Right-of-Way Rules

Right-of-way is the single most-missed topic across every state's permit test. The rules are simple once you memorize them. At a 4-way stop, the first vehicle to fully stop goes first; if two arrive together, the driver on the right has the right of way. At an uncontrolled intersection, yield to any vehicle already in the intersection and to the driver on your right. At roundabouts, yield to traffic already circulating and enter only when there is a safe gap. Always yield to pedestrians in any crosswalk, marked or unmarked, and to emergency vehicles with lights and sirens — pull right and stop. When turning left across oncoming traffic, you must yield to oncoming vehicles. Yield does not give you the right of way; it requires you to give it up.

Following Distance & Safety

The Iowa driver's manual recommends a 3-to-4-second rule, slightly more conservative than the standard 3-second rule used elsewhere: pick a fixed point on the road -- an overhead sign or tree -- and count as the vehicle ahead of you passes it; if you reach the same point before finishing your count to at least three, you're following too closely.

Road Sign Colors & Shapes

Road signs on the IA permit test follow the federal Manual on Uniform Traffic Control Devices, so shapes and colors are consistent across the country. Memorize the shapes first: octagon always means stop, downward triangle means yield, diamond means warning, pentagon marks a school zone, round warns of a railroad crossing, and horizontal rectangle is a guide sign. Then learn the colors: red is stop or prohibition, yellow is general warning, orange is construction, green is directions and exits, blue is driver services, brown is recreation, and fluorescent yellow-green is for schools and pedestrians. Practice identifying signs by shape and color alone — see the full visual cheat sheet on our Iowa road-signs page.

Key Iowa Numbers to Memorize

If you only remember a handful of facts going into the test, make it these. Every one of them maps to questions that have appeared on the real IA exam.

Parking Rules

Parking questions on the Iowa permit test cover two patterns everywhere. For parallel parking, your wheels should be no more than 12 inches from the curb. For hill parking, the kerb rule decides which way your front wheels point: facing downhill (with or without a curb), turn the wheels toward the curb; facing uphill with a curb, turn the wheels away from the curb so they rest against it; facing uphill with no curb, turn the wheels toward the edge of the road. Always set the parking brake and leave the car in park (or in low gear with a manual).

Iowa's no-parking zones (Iowa Code 321.358) are noticeably tighter than most states: within 5 feet of a fire hydrant -- the shortest hydrant distance of any state -- on a crosswalk itself, within 10 feet on the approach to a flashing beacon, stop sign, or traffic-control signal, and within 50 feet of the nearest rail at a railroad crossing (unless parked parallel to the rail with no red light showing).

GDL Restrictions (IA)

Iowa's intermediate license needs just 20 hours of supervised driving, including 2 at night -- among the lowest hour requirements of any state -- after holding the instruction permit at least 12 months with a clean 6-month record. You can drive unsupervised from 5 a.m. to 12:30 a.m.; driving 12:30 a.m.-5 a.m. needs an exception (work or an emergency). Passenger restrictions: no more than one unrelated minor for the first 6 months. Expect 1-3 GDL questions on the IA exam.

DUI & Drug Laws

DUI questions go beyond the BAC limits in Section 2. Three concepts you must know: implied consent means refusing a chemical test triggers automatic license suspension on top of any DUI charge. Prescription and over-the-counter drugs can also impair driving — antihistamines, sleep aids, painkillers, and some cold medicines list "do not operate heavy machinery" warnings, and driving impaired by them is a DUI even if you have a valid prescription. Marijuana — even where state-legal — is treated like alcohol for driving: any detectable impairment can result in a DUI, and edibles can take 1–3 hours to peak. The only safe BAC and the only safe THC level for driving is zero. There is no quick way to sober up; only time will lower your BAC.

Now Test What You've Studied

Five questions pulled at random from our Iowa question bank — a mix of road signs, traffic laws, and right-of-way. Answer to see the correct choice and a short explanation. For a full timed exam, take the free practice test.

Iowa Study Guide FAQ