Idaho Car / Permit practice
Idaho Car / Permit: Traffic Laws practice test
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · August 12, 2026
16 questions · pass with 13 correct. You get instant feedback and an explanation after every answer.
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12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. On an Idaho interstate with no posted limit, how fast may a vehicle travel?
Correct answer: 75 miles per hour
Interstates carry a default ceiling of seventy-five miles per hour, and eighty is permitted only on stretches where that higher number is actually signed.
Source: Idaho Driver's Handbook — Speed Limits
2. A load sticks out four feet or more past the back of a vehicle in Idaho. What must be displayed at the end of it during daylight?
Correct answer: A red flag measuring at least 18 inches square
Daylight hours call for a red flag measuring at least eighteen inches on each side; once it is dark, a red lamp visible from five hundred feet takes the flag's place.
Source: Idaho Driver's Handbook — Other Laws You Need to Know
3. Which arm signal tells other drivers that you intend to turn right?
Correct answer: Arm out the window with the hand pointing upward
The right-turn gesture puts the arm out the window with the hand raised, which distinguishes it from the straight-out left signal and the downward slow-or-stop signal.
Source: Idaho Driver's Handbook — Turns
4. What does Idaho law say about text messaging behind the wheel?
Correct answer: It is an infraction, though hands-free use is excepted, and it brings a fine rather than points
Reading, writing, or sending a written message while driving is an infraction, hands-free operation is carved out, and a conviction brings a fine without adding points to a regular driver's record.
Source: Idaho Driver's Handbook — Cell Phones
5. Idaho bars passing within how many feet of an intersection unless traffic-control devices indicate otherwise?
Correct answer: 100 feet
The same one-hundred-foot buffer that applies at intersections also covers railroad crossings and obstructed bridges or tunnels.
Source: Idaho Driver's Handbook — Passing
6. When must Idaho traffic stop for a school bus that has its red lights flashing?
Correct answer: Traffic must stop and remain stopped until the children are clear of the bus and the roadway
Every direction must halt and stay halted while the red lamps flash or the stop arm is out, until the children are clear; the one relief is for drivers headed the opposite way on a highway of four or more lanes carrying two lanes each way.
Source: Idaho Driver's Handbook — Stopping
7. Even in the narrow situations where Idaho permits passing on the right, what may a driver never do?
Correct answer: Leave the roadway to get around the other vehicle
The maneuver has to stay on the pavement, so dropping a wheel onto the shoulder or the dirt to get around the vehicle ahead is not allowed under any circumstances.
Source: Idaho Driver's Handbook — Passing
8. Unless signs say otherwise, what is the top lawful speed in an Idaho residential, business, or urban district?
Correct answer: 35 miles per hour
Idaho caps districts of that kind at thirty-five miles per hour whenever no other limit is posted.
Source: Idaho Driver's Handbook — Speed Limits
9. Where does Idaho law forbid making a U-turn?
Correct answer: On a curve or near a hillcrest where approaching drivers could not see you within 500 feet
U-turns are barred on curves, at or near the top of a rise where oncoming drivers could not spot you from five hundred feet away, and anywhere passing is prohibited, in addition to spots posted against them.
Source: Idaho Driver's Handbook — Turns
10. Which of these is a violation of Idaho law even though it involves no speeding?
Correct answer: Staying in the extreme left lane long enough to impede traffic moving at a lawful speed
Crawling along so slowly that you break up the normal flow is unlawful, and holding the far-left lane while slower traffic backs up behind you is called out specifically.
Source: Idaho Driver's Handbook — Speed Limits
11. Under Idaho's passing exception, when may a car, pickup, or motorcycle briefly exceed the posted limit?
Correct answer: By as much as 15 mph over the limit when overtaking a slower vehicle on a two-lane road posted at 55 or higher
The allowance covers a vehicle that is not towing anything, on a two-lane road signed at fifty-five or higher, overtaking someone traveling under the limit, and it permits no more than fifteen miles per hour over; it does not apply in work zones.
Source: Idaho Driver's Handbook — Passing
12. How far ahead must an Idaho driver begin signaling a turn or lane change in a business or residential area?
Correct answer: 100 feet
Town driving uses a distance standard of one hundred feet, while the highway and freeway standard is stated as five seconds instead.
Source: Idaho Driver's Handbook — Turns
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Every Idaho question is written from the official Idaho driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free