Iowa Permit Test Cheat Sheet
A condensed, skimmable recap of the rules most worth knowing cold before your exam — distilled from our full Iowa practice question bank. This isn't a replacement for the Iowa Driver's Manual; confirm anything time-sensitive with Iowa DOT.
Iowa Licensing & Law
- The knowledge exam is 35 questions requiring 80% (28 correct) to pass, given by the Iowa DOT.
- An instruction permit is available at just 14, with parent or guardian consent — one of the youngest starting ages nationally.
- A Special Minor's Restricted License is available at 14½, allowing unsupervised driving to school, work, or farm tasks within 25 miles.
- The permit must be held 12 months total, with 20 hours of supervised driving and an approved driver-ed course, before an intermediate license at 16.
- An under-18 applicant within 30 days of turning 14 can take a 25-question online knowledge test at home, proctored by a licensed parent, instead of the standard 35-question in-person version.
Intermediate License Restrictions
- No driving 12:30 a.m.-5 a.m. unsupervised.
- The passenger restriction (max one unrelated minor for 6 months) is opt-in — a parent can waive it entirely at license issuance.
- Siblings and other minors living in the same household are excluded from the passenger restriction regardless.
- No phone, smartphone, tablet, or similar device use while driving — permanently installed vehicle equipment is exempt.
DUI, Alcohol & Drugs
- Zero tolerance for under-21 drivers means a BAC of 0.02% or higher, versus the standard 0.08% adult limit.
- A first zero-tolerance violation brings a 60-day revocation; refusing chemical testing brings a harsher one-year revocation instead.
- Alcohol degrades judgment, reaction time, coordination, and vision — all necessary for safe driving, even below the legal limit.
Distracted Driving
- An intermediate license holder can't use a phone, smartphone, tablet, or similar device while driving at all.
- Equipment permanently installed in the vehicle, like built-in navigation, is exempt from that ban.
Right-of-Way
- With no signs or signals controlling an intersection, yield to whoever approaches from your right.
- A driver turning left has to let oncoming traffic and crossing pedestrians clear before completing the turn.
- A vehicle already on the roadway has the right-of-way over one entering from a driveway, alley, or parking lot.
Traffic Signals
- A solid red light means a full stop; treat a flashing red exactly like a stop sign.
- A flashing yellow signal means proceed with caution — no full stop is required.
- If a signal is dark or malfunctioning, treat the intersection as if every approach had its own stop sign.
Traffic Signs
- Shape is a nationwide code: octagon means stop, downward-pointing triangle means yield, diamond means warning.
- Color carries meaning too — red for stop/yield/prohibition, orange for construction, yellow for warnings.
- A red circle with a diagonal slash is the standard national way to say an action isn't allowed.
Lane Markings & Usage
- Yellow lines separate opposing directions of traffic; white lines separate lanes traveling the same direction.
- A broken line permits a lane change when safe; a solid line discourages crossing.
Turning
- Signal well ahead of the turn itself, so other drivers actually have time to react.
- A right turn on red is generally legal after a complete stop and yielding, unless a posted sign says otherwise.
- A safe U-turn always needs a clear view of traffic in both directions.
Passing
- A double solid yellow line prohibits passing for traffic in either direction.
- The posted speed limit still applies mid-pass.
Following Distance
- Hold at least a 3-second gap in normal conditions, and stretch that further in rain, fog, or heavy traffic.
- Tailgating is a leading cause of rear-end crashes.
Freeway Driving
- Use the acceleration lane to match highway speed before merging.
- Signal and move into the exit lane well ahead of your exit.
Roundabouts
- Traffic circulates counterclockwise, and vehicles already inside have the right-of-way over ones entering.
Railroad Crossings
- Slow down, look both ways, and listen before crossing, even where there are no gates or lights.
- Never stop on the tracks, and never drive around a lowered gate.
Pedestrians & Crosswalks
- Every intersection is a legal crosswalk, marked or not, and pedestrians there have the right-of-way.
- A white cane or guide dog marks a visually impaired pedestrian — stop and yield without exception.
School Zones
- Children move less predictably than adult pedestrians, so slow down and follow any crossing guard's directions.
Bicycles
- Cyclists are generally treated as vehicle operators, with the same rights and duty to follow traffic law.
- Give a cyclist at least 3 feet of clearance when passing.
Sharing the Road with Large Vehicles
- If you can't see a truck driver's mirrors, assume they can't see you either.
- Trucks need much more distance to stop than a car does.
Move Over & Emergency Vehicles
- Move over a lane away from a stopped emergency vehicle when safe, or slow down noticeably if you can't change lanes.
Night Driving
- Switch to low beams within roughly 500 feet of an oncoming vehicle so you don't blind the other driver.
Fatigue & Drowsy Driving
- Yawning, heavy eyelids, and drifting out of your lane are early signs your body is losing the fight to stay alert.
Vehicle Equipment
- Headlights are generally required starting a half hour after sunset through a half hour before sunrise.
Work Zones
- Fines commonly double for violations inside a posted, active construction or maintenance zone.
Insurance & Registration
- Drivers must be ready to present a license, registration, and proof of insurance at any traffic stop.
After a Collision
- Check for injuries and call 911 before dealing with any paperwork.
- Stop and exchange information with everyone involved — leaving without doing so is a hit-and-run.
Seatbelts & Child Safety
- Iowa law requires a seatbelt for the driver and every passenger, front seat and back.
School Buses
- Traffic in both directions on an undivided road must stop for a school bus with flashing red lights, and wait until the lights stop flashing.
Speed Limits
- The basic speed law requires a safe speed for conditions, which can be lower than the posted limit.
Signs to Know
Quick visual recap of commonly tested signs — see the full Permit practice test for sign-recognition questions.
Come to a complete stop, then proceed only when it is safe to do so
Slow down and be ready to stop, giving the right-of-way to other traffic or pedestrians
Do not drive past this sign in this direction; the roadway is closed to traffic entering here
You are driving against the flow of traffic and must safely turn around or stop immediately
Traffic on this road or lane may only travel in the direction the arrow points
Making a U-turn is prohibited at this location
The maximum legal speed under normal conditions on this road is 55 mph
A railroad track crosses the road ahead; slow down, look, and listen for a train before crossing
Parking is not allowed in this area
Drivers may not turn right at this intersection while the signal is red
Two lanes of traffic ahead are merging into one; be prepared to adjust speed and position
The road ahead curves; reduce speed as needed for the curve
You are entering a section of road with traffic moving in both directions; stay in your lane
A stop sign is ahead; begin slowing down now to be able to stop when you reach it
Drivers must keep to the right of a divider, island, or obstruction ahead
Passing other vehicles is prohibited in this zone
Watch for pedestrians and slow down or stop if needed
Slow down and watch for children crossing near the school
Watch for cyclists who may be crossing or entering the road ahead
Watch for deer crossing, especially at dawn or dusk
Last reviewed: 2026-07-22