Idaho Permit Test Study Guide (2026)

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

The Idaho Driver's Handbook is your main study tool. The ITD writes every test question from this book. Read each chapter and use the free ITD sample test on itd.idaho.gov. Audio versions are also available if you prefer to listen.

Idaho Speed Limits

Speed limits are one of the most-tested topics on the ID permit exam, and the questions usually test Idaho's statutory default limits -- what the speed is when no sign is posted. Under Idaho Code 49-654, Idaho's defaults are 35 mph in any residential, business, or urban district, 65 mph on state highways, and 75 mph on interstates, unless otherwise posted. School zone speed limits are set separately (Idaho Code 49-658) and posted locally. Always obey the basic-speed law: never drive faster than is safe for current conditions, even under the posted or statutory limit.

Alcohol & BAC Limits

Expect at least one alcohol question on the Idaho 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 Idaho's zero-tolerance threshold for drivers under 21 is 0.02% (Idaho Code 18-8004). A violation in the 0.02%-0.07% range brings a fine up to $1,000 and a 1-year license suspension (the first 90 days cannot be reduced), plus a required substance-abuse evaluation. A BAC of 0.08% or higher brings full adult DUI charges.

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

Idaho's driver manual teaches the 3-second rule as the minimum safe following distance: pick a fixed point on the road, wait for the vehicle ahead of you to pass it, then count one-thousand-one, one-thousand-two, one-thousand-three. Increase your following distance at higher speeds and in bad weather.

Road Sign Colors & Shapes

Road signs on the ID 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 Idaho road-signs page.

Key Idaho 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 ID exam.

Parking Rules

Parking questions on the Idaho 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).

Idaho's no-parking zones (Idaho Code 49-660) you must memorize: within 15 feet of a fire hydrant, within 20 feet of a crosswalk at an intersection, within 30 feet on the approach to a flashing signal, stop sign, yield sign, or traffic control signal, and within 50 feet of the nearest rail at a railroad crossing.

GDL Restrictions (ID)

Idaho's supervised instruction permit: log 50 hours of supervised driving, including 10 at night, over at least 6 months, with a supervisor who holds a valid license, is 21 or older, and sits beside you. Only the supervisor and permittee may occupy the front seat; other passengers may ride in back with a seatbelt or child restraint. A 15-year-old permit holder generally may not practice after dark except for those required nighttime hours. Expect 1-3 GDL questions on the ID 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 Idaho 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.

Idaho Study Guide FAQ