Idaho DMV Practice Test 1
Practice Test 1 covers the Idaho DMV knowledge test foundations — the meaning of steady yellow, flashing red, and green traffic signals, Idaho's 0.08% adult BAC limit, safe following distance under normal conditions, what to do when parking uphill with a curb, hydroplaning causes and response, what to do when an animal enters the roadway on Idaho's rural roads, red curb meaning, roundabout entry, and how to reduce night glare. These are the core topics on every version of the Idaho written knowledge test.
Why Take This Idaho Practice Test?
The Idaho DMV written knowledge test has 40 questions and requires 70% to pass — you need to answer at least 28 correctly. Practice Test 1 targets the signal meanings, lane marking rules, and Idaho-specific questions that appear on every version of the Idaho exam. Idaho's 70% threshold is the lowest of any state in this region, but consistent preparation across all categories ensures you pass comfortably.
Sample Questions from This Test
The questions below come directly from this test's question bank. Each is based on the official Idaho Driver Handbook. See how many you can answer before starting — then take the full test above for answers and complete explanations.
- What does a steady yellow traffic signal mean?
- What is the legal blood alcohol concentration limit for adult drivers?
- What is the safest following distance under normal driving conditions?
- What should you do when parking uphill with a curb?
- What should you do if your vehicle starts to hydroplane?
Take the test above to see correct answers and read the full explanations for every question.
Idaho DMV Topics Covered in This Test
Every question in this test is drawn from the official Idaho Driver Handbook. Here is a breakdown of the specific topics covered:
- Steady Yellow Signal — prepare to stop if you can safely do so before the intersection
- Flashing Red Signal — complete stop required, treat as a stop sign
- Green Signal — proceed if intersection is clear, yield to any remaining pedestrians
- Idaho BAC Limit — 0.08% legally impaired for drivers 21 and older
- Safe Following Distance — 3 seconds minimum under normal conditions
- Hill Parking Uphill with Curb — turn wheels left (away from curb)
- Hydroplaning Cause — thin water film between tires and road at excessive speed
- Hydroplaning Response — ease off accelerator, steer straight, do not hard brake
- Animal in Roadway — brake firmly rather than swerve; swerving causes more serious crashes
- Red Curb — no stopping, standing, or parking at any time
- Roundabout Entry — yield to all circulating traffic before entering
- Night Glare Reduction — look toward the right edge of your lane
- Speed Limits Purpose — protect safety, not arbitrary restrictions
- Seat Belt Purpose — reduce injury and death in crashes
- Right Turn on Red — full stop first, yield to all, then turn if safe and not prohibited
Idaho DMV Test — Key Facts
Knowing the specific numbers and rules before your Idaho written knowledge test gives you a real advantage. Here are the key facts for this test:
- Idaho DMV test: 40 questions, 70% required to pass (28 correct minimum)
- Idaho BAC limit: 0.08% for drivers 21 and older
- Steady yellow: Prepare to stop — the signal is about to turn red
- Hill parking uphill with curb: Wheels left (away from curb) — vehicle rolls into curb if brakes fail
- Hydroplaning: Ease off gas, steer straight — do not brake hard
- Animal in roadway: Brake firmly — swerving to avoid an animal can cause a rollover or head-on collision
How to Use This Test Effectively
Getting the most out of your Idaho DMV practice time takes more than clicking through questions. Use these strategies:
- Idaho's 70% passing threshold is the most forgiving in the Pacific Northwest. You can miss up to 12 of 40 questions. But consistent 90%+ practice scores eliminate test-day surprises and ensure you pass on your first attempt.
- Animals in the roadway are a real Idaho hazard. Idaho's highways — US-93 through the Sawtooth Valley, ID-75 along the Salmon River, and US-20 near Island Park — all have frequent deer, elk, and moose crossings. Brake firmly rather than swerving, which can cause a more serious crash.
- Hydroplaning requires restraint, not reaction. When your steering goes light on a wet Idaho road, ease off the gas gently. Hard braking during hydroplaning causes a spin. Steer straight until the tires regain contact with the road.
- Hill parking uphill with curb: wheels left. If brakes fail and the vehicle rolls backward, wheels pointing left (away from curb) cause the vehicle to roll into the curb and stop rather than into traffic.
- Idaho roundabouts are common in Boise and growing cities. Yield to vehicles already circulating in the roundabout before you enter. Travel counterclockwise. Signal when you are about to exit.
Frequently Asked Questions
How many questions are on the Idaho DMV written test?
40 questions. You must answer at least 28 correctly (70%) to pass the Idaho written knowledge test.
What is Idaho's adult BAC limit?
0.08%. Drivers 21 and older are considered legally impaired at a blood alcohol content of 0.08% or higher in Idaho.
What should I do when an animal appears in the road on an Idaho highway?
Brake firmly and reduce speed. Do not swerve sharply — swerving to avoid a deer or elk can cause a rollover or put you in the path of oncoming traffic. A controlled brake is safer than an uncontrolled swerve.
What is the safest following distance in Idaho?
At least 3 seconds under normal driving conditions. Pick a fixed point ahead — if you pass it before counting to 3, you are following too closely. Increase to 4-6 seconds in adverse conditions.
What causes hydroplaning on Idaho roads?
Driving too fast on a wet road surface. When speed is too high for the amount of water on the road, tires cannot displace the water fast enough and begin to ride on a thin water film rather than the road surface.
Complete Study Guide: All 50 Questions with Answers
All 50 questions from Idaho Practice Test 1 are listed below with correct answers and explanations from the official Idaho Driver's Manual. Pay close attention to the signal meanings and animal-in-roadway questions — these appear on every version of the Idaho written knowledge test.
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Q1. What does a steady yellow traffic signal mean?
Correct answer: Prepare to stop
Why: A steady yellow light warns that the signal is about to turn red.
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Q2. When two vehicles arrive at an uncontrolled intersection at the same time, who goes first?
Correct answer: The vehicle on the right
Why: At uncontrolled intersections, the driver on the right has the right-of-way.
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Q3. What does a solid double yellow centerline mean?
Correct answer: No passing either direction
Why: Double solid yellow lines prohibit passing in both directions.
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Q4. What must you do at a flashing red traffic signal?
Correct answer: Stop and proceed when safe
Why: A flashing red light requires a complete stop before proceeding.
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Q5. What is the safest following distance under normal driving conditions?
Correct answer: Three seconds
Why: A three-second following distance provides time to react safely.
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Q6. What should you do before turning right at a red light?
Correct answer: Stop and yield before turning
Why: A full stop and yielding to traffic and pedestrians is required.
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Q7. What does a diamond-shaped road sign indicate?
Correct answer: Warning of hazards
Why: Diamond-shaped signs warn drivers of potential hazards.
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Q8. When should headlights be used?
Correct answer: From sunset to sunrise and low visibility
Why: Headlights are required at night and when visibility is poor.
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Q9. What does a broken white lane line mean?
Correct answer: Lane changes permitted
Why: Broken white lines allow lane changes when safe.
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Q10. What should you do if an emergency vehicle approaches with flashing lights?
Correct answer: Pull over and stop
Why: Drivers must pull over and stop for emergency vehicles.
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Q11. What is the purpose of speed limits?
Correct answer: Promote traffic safety
Why: Speed limits are set to reduce crashes and injuries.
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Q12. What does a yield sign require drivers to do?
Correct answer: Slow down and give right-of-way
Why: Yield signs require slowing and yielding to other traffic.
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Q13. When is it legal to pass on the right?
Correct answer: When the vehicle ahead is turning left
Why: Passing on the right is allowed when the vehicle ahead is making a left turn.
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Q14. What should you do when approaching a school bus with flashing red lights?
Correct answer: Stop
Why: Drivers must stop when a school bus displays flashing red lights.
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Q15. What does a solid white line mean?
Correct answer: Lane changes discouraged
Why: Solid white lines discourage lane changes.
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Q16. What should you do if your vehicle begins to skid?
Correct answer: Steer in the direction of the skid
Why: Steering into the skid helps regain control.
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Q17. What is required at a stop sign?
Correct answer: Come to a complete stop
Why: Drivers must make a full stop at stop signs.
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Q18. What does a flashing yellow signal mean?
Correct answer: Proceed with caution
Why: Flashing yellow signals warn drivers to proceed carefully.
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Q19. What is the legal blood alcohol concentration limit for adult drivers?
Correct answer: 0.08%
Why: Driving with a BAC of 0.08% or higher is illegal.
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Q20. What should you do before changing lanes?
Correct answer: Check mirrors and blind spots
Why: Checking mirrors and blind spots ensures a safe lane change.
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Q21. What does a round yellow sign indicate?
Correct answer: Railroad crossing
Why: Round yellow signs warn of railroad crossings.
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Q22. What is the safest action when driving in fog?
Correct answer: Slow down
Why: Reducing speed improves reaction time in fog.
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Q23. What should you do if traffic signals are not working?
Correct answer: Treat as a four-way stop
Why: Non-working signals must be treated as four-way stops.
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Q24. What does a pentagon-shaped sign indicate?
Correct answer: School zone
Why: Pentagon-shaped signs mark school zones or crossings.
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Q25. When must drivers yield to pedestrians?
Correct answer: At crosswalks
Why: Drivers must yield to pedestrians in crosswalks.
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Q26. What should you do when approaching a curve?
Correct answer: Slow before entering
Why: Slowing before the curve helps maintain control.
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Q27. What does a green arrow signal allow?
Correct answer: Only movement in arrow direction
Why: A green arrow permits movement only in its direction.
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Q28. What is the purpose of seat belts?
Correct answer: Reduce injury risk
Why: Seat belts reduce injury and prevent ejection in crashes.
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Q29. What should you do if you miss your freeway exit?
Correct answer: Take the next exit
Why: Drivers should continue to the next exit safely.
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Q30. What does a white rectangular sign usually indicate?
Correct answer: Regulation
Why: White rectangular signs provide regulatory information.
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Q31. What should you do if your brakes fail?
Correct answer: Pump the brakes
Why: Pumping brakes and downshifting can help slow the vehicle.
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Q32. What does a broken yellow line indicate?
Correct answer: Passing allowed with caution
Why: Broken yellow lines allow passing when safe.
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Q33. What should you do at a railroad crossing without signals?
Correct answer: Stop and look
Why: Drivers must stop, look, and listen before crossing.
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Q34. What is hydroplaning caused by?
Correct answer: Water on the roadway
Why: Hydroplaning occurs when tires lose contact due to water.
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Q35. What does a red octagonal sign mean?
Correct answer: Stop
Why: Octagonal signs are always stop signs.
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Q36. What should you do when parking uphill with a curb?
Correct answer: Wheels away from curb
Why: Turning wheels away from the curb prevents rolling.
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Q37. What is the main danger of tailgating?
Correct answer: Reduced reaction time
Why: Tailgating reduces time to react to hazards.
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Q38. What does a green traffic signal mean?
Correct answer: Proceed when safe
Why: A green light allows drivers to go if the intersection is clear.
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Q39. When should high-beam headlights be dimmed?
Correct answer: Within 500 feet of oncoming traffic
Why: High beams must be dimmed to avoid blinding other drivers.
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Q40. What should you do when entering a roadway from a driveway?
Correct answer: Yield to traffic
Why: Drivers entering must yield to traffic already on the road.
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Q41. What does a red curb indicate?
Correct answer: No stopping or parking
Why: Red curbs mean stopping or parking is not allowed.
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Q42. What is the safest action when approaching an intersection?
Correct answer: Be prepared to yield
Why: Being ready to yield helps prevent collisions.
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Q43. What does a white triangular sign with a red border mean?
Correct answer: Yield
Why: This sign indicates a yield requirement.
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Q44. What should you do if an animal enters the roadway?
Correct answer: Brake firmly and stay in lane
Why: Firm braking while staying in lane reduces risk.
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Q45. What is the purpose of turn signals?
Correct answer: Communicate intentions
Why: Turn signals tell other drivers your intentions.
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Q46. What should you do when driving downhill?
Correct answer: Shift to a lower gear
Why: Lower gears help control speed downhill.
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Q47. What does a solid yellow line next to a broken yellow line mean?
Correct answer: Passing allowed only on broken-line side
Why: Passing is allowed only on the side with the broken line.
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Q48. What should you do when approaching a roundabout?
Correct answer: Yield to traffic in the circle
Why: Drivers must yield to traffic already in the roundabout.
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Q49. What should you do if your vehicle starts to hydroplane?
Correct answer: Ease off the accelerator
Why: Easing off the accelerator helps regain traction.
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Q50. What is the safest way to avoid glare at night?
Correct answer: Look toward the right edge of the road
Why: Looking toward the right edge reduces headlight glare.