📖 Idaho DMV Study Guide

Everything important from the Idaho Driver's Handbook (July 2024) — organized for the exam

⭐

Memorize these numbers first. Idaho DMV test questions are frequently built around specific distances, speeds, BAC levels, and time periods. These come up constantly.

Speed Limits

HIGH FREQUENCY

35 mph

Maximum in any residential, business, or urban district unless otherwise posted (p.69). Always obey signed limits — many town streets are posted lower.

School zones

Obey the posted school-zone limit. Idaho applies enhanced penalties for school-zone violations (p.50, 69). Watch for crossing guards and patrol officers.

75 / 65 mph

Standard maximum on rural Idaho interstates is 75 mph (80 where posted). Urban interstates: 65 mph. State highways: 65 mph (70 where posted). Heavy trucks (5+ axles, 26,000+ lb): 10 mph below posted on non-urban interstates, max 65 on urban interstates (p.68).

Basic Rule

Idaho's basic rule: drive at a speed that is reasonable and prudent for the existing conditions. Driving too slowly so as to impede traffic flow is also a violation (p.68-69).

3 seconds

Idaho's recommended minimum following distance under good conditions. Pick a fixed point ahead; if you reach it before counting "one-thousand-one, one-thousand-two, one-thousand-three," you are too close (p.79).

Several×

In bad weather, multiply the 3-second rule by several. Allow MORE than 3 seconds when following a motorcycle, and 2 car lengths per 10 mph behind a snowplow (p.79, 104, 109).

📏

Critical Distances & Clearances

HIGH FREQUENCY

15 ft

Do not park within 15 feet of a fire hydrant (p.81).

20 ft

Do not park within 20 feet of a crosswalk at an intersection, or 20 feet of a fire station driveway (p.81).

30 ft

Do not park within 30 feet of any stop sign, yield sign, or traffic signal (p.81).

50 ft

Do not park within 50 feet of railroad tracks. Bridges, overpasses, and double-parking are always prohibited (p.81).

18 in

Parallel-parked vehicle must be parallel to and within 18 inches of the curb or edge of roadway (p.80).

Mirror

After passing, signal and return to the right lane only when you can see the vehicle you passed in your rear-view mirror (p.77).

500 / 200 ft

Dim high beams within 500 feet of an oncoming vehicle and within 200 feet when overtaking a vehicle ahead (p.43). High beams must illuminate at least 350 ft; low beams at least 100 ft (p.38).

500 ft

Headlamps and tail lamps must be lit from sunset to sunrise AND any time visibility drops to 500 feet or less (rain, fog, smoke, dust). Use low beams in fog or heavy precipitation (p.43, 110).

100 ft / 5 sec

Signal at least 100 feet before turning in business or residential areas. On freeways/highways: signal at least 5 seconds before lane change or exit (p.72, 85).

All seats

Idaho law requires every occupant to wear safety belts and/or shoulder straps. Children 6 and younger must be in approved child safety seats. Children under 13 should ride in the back seat (p.40-41).

3 ft

Allow at least 3 feet when passing a bicyclist; never sound your horn near horseback riders. Watch for cyclists between your car and the curb when turning right (p.97-100).

Stop

Stop and remain stopped for any school bus with flashing red lights and/or extended stop arm — until lights turn off, arm in, and all children clear of roadway. Exception: traveling OPPOSITE direction on a 4+ lane highway with 2 lanes each way (p.70).

🍺

DUI & Alcohol Numbers

ALWAYS ON TEST

0.08

Drivers 21 and older are DUI at a BAC of 0.08 or more. Commercial vehicle drivers: 0.04 or more. A BAC of 0.20 or more triggers enhanced penalties (p.131).

0.02

Drivers under 21 are DUI at a BAC of 0.02 or more — Idaho's strict under-21 standard, far below the adult limit (p.131).

90–180 days

1st DUI conviction: license suspended 90 to 180 days with absolutely NO driving privileges the first 30 days. Up to 6 months jail and up to a $1,000 fine (p.132).

$250 + 1 yr

Idaho's implied-consent law: refusing the evidentiary BAC/drug test brings a $250 civil penalty + 1-year absolute suspension. A 2nd refusal in 10 years = 2-year absolute suspension (p.126-127).

Time only

Coffee, food, exercise, and cold air do NOT sober you up — only the passage of time will return you to normal once alcohol is in your bloodstream (p.129).

🎓

Teen / GDL Numbers

ON EXAM

14½

Minimum age for an Idaho Driver Training (DT) Permit — must be enrolled in an approved driver training program, valid only with a driver-training instructor (p.15).

Minimum age to be licensed in Idaho. Drivers under 17 must first complete approved Driver Training (30 classroom + 6 BTW hours) plus the GDL supervised period (p.3, 32).

5a–10p

Drivers under 16 may drive only between 5:00 a.m. and 10:00 p.m. — outside those hours, only with a licensed driver 21+ in the front seat (p.16).

1 passenger

During the first 6 months of licensure, drivers under 17 may carry no more than ONE passenger under 17 (family by blood/adoption/marriage exempt) (p.16).

50 hrs / 10 night

GDL supervised driving requires 50 hours total — 10 of which must be at night. Plus a minimum 6-month, violation-free supervised period before licensing (p.19).

30 / 6

Idaho's approved Driver Training: 30 classroom hours plus 6 hours behind-the-wheel with an approved instructor (p.19).

⏱️

Following Distance & Time Rules

ON EXAM

3 seconds

Idaho's recommended minimum following distance under good conditions — pick a fixed point ahead, and if you reach it before counting "one-thousand-one, one-thousand-two, one-thousand-three" you are too close (p.79).

Several×

In bad weather, increase the 3-second rule several times. Allow MORE than 3 seconds when following a motorcycle, and 2 car lengths per 10 mph behind a snowplow (p.79, 104, 109).

10–15 sec

Good drivers look 10 to 15 seconds ahead — about a city block in town, much further on the highway (p.89).

Texting

Reading, writing, or sending text messages while driving is illegal in Idaho — an infraction. Hands-free use without either hand is exempt. Inattentive driving is a separate citation (p.92, 43).

🚦

Road signs are tested heavily. Know each sign's shape, color, and meaning. The real test often shows a sign description and asks what it means.

🔴

Sign Shapes — Each Shape Has One Meaning

ALWAYS TESTED

Shape	Meaning	Example
Octagon (8-sided)	STOP — always and only	Stop sign
Triangle (pointing down)	YIELD — give right of way	Yield sign
Diamond	WARNING — hazard ahead	Curve, pedestrian, deer
Pentagon (5-sided)	SCHOOL ZONE	School crossing
Pennant (triangle right)	NO PASSING ZONE	No-passing pennant
Round (circle)	RAILROAD CROSSING advance warning	RR crossing sign
Rectangle (vertical)	REGULATORY — rules you must follow	Speed limit, turn restrictions
Rectangle (horizontal)	GUIDE or INFORMATION	Street name, mile marker
X-shaped crossbuck	RAILROAD CROSSING — treat like yield	Railroad crossbuck

🎨

Sign Colors — Color Tells You the Category

ALWAYS TESTED

Color	Category	What It Means
Red	Regulatory — STOP / PROHIBIT	Stop, yield, do not enter, wrong way, no-turn circles
Yellow	WARNING	General hazard warnings — curves, hills, intersections, animals
Orange	WORK ZONE / CONSTRUCTION	Construction ahead, road crew, slow down. In Idaho, exceeding a posted work-zone speed limit can result in an enhanced, fixed penalty — and the 15-mph passing-speed exception does NOT apply in work zones (p.69, 76).
Green	GUIDE / DIRECTIONAL	Highway exits, distances, direction, mile markers
Blue	SERVICES	Gas, food, lodging, hospital, rest area
Brown	RECREATION / CULTURAL	Parks, campgrounds, historical sites, scenic areas
White	REGULATORY	Speed limits, lane rules, turn restrictions
Fluorescent Yellow-Green	WARNING — pedestrian / school / bike	School zones, crosswalks, bike lanes
Fluorescent Pink	INCIDENT MANAGEMENT	Crash clean-up, debris removal, temporary traffic control

⚠️

Signs That Are Frequently Confused

TRICKY

No Passing Pennant vs. No U-Turn: The pennant (pointing right) = no passing. A circle with a slash over a U-turn arrow = no U-turn. Very different.

Crossbuck (RR) vs. Stop Sign: The crossbuck (white X) = yield/slow down and check. Only stop if a train is coming. The octagon = always stop.

Divided Highway Begins vs. Ends: Begins = two arrows pointing apart (median starts). Ends = two arrows merging together (median ends — expect two-way traffic).

Merge vs. Lane Ends: Merge = two roads joining (both cars adjust). Lane Ends = one lane disappears — that driver must yield and merge.

Red Circle with Slash: Always means that action is PROHIBITED. No left turn, no trucks, no bicycles — whatever is inside the circle is forbidden.

⭐

Right of way is the #1 failure topic on the DMV knowledge test. Master every scenario below — these questions will be on your exam.

⛽

The Core Right-of-Way Rules

MOST TESTED

Uncontrolled intersection — arrive at same time: Yield to the driver on your RIGHT. This is the most tested right-of-way rule.

Left turn at green light: You must always yield to oncoming traffic AND pedestrians — even with a green light. A green light is permission to go, not a guarantee of right of way.

Pedestrians in a crosswalk: Always yield. Stop and wait until the pedestrian has completely crossed — not just stepped back. This includes jaywalkers in many situations.

Blind pedestrian (white cane / guide dog): Absolute right of way — you must stop regardless of where they are crossing.

Four-way stop: First to arrive goes first. Simultaneous arrival = yield to the driver on your right. Straight traffic before turning traffic if both arrive at same time from opposite directions.

Emergency vehicles (lights + siren): Pull to the right edge of the road and stop. Clear intersections first — never stop IN an intersection.

Entering from driveway / private road: Always yield to all traffic on the public road — you have no right of way entering from private property.

Roundabout: Vehicles inside the roundabout always have right of way. Entering traffic must yield. When exiting, yield to pedestrians at the crosswalk.

Merging onto a highway: Traffic already on the highway has right of way. The merging vehicle must yield and find a safe gap.

Non-functioning traffic signal: Treat as an all-way stop. All drivers stop, yield, and take turns.

💡

Right-of-Way Scenarios That Trick People

TRICKY

Yellow light: It does NOT mean speed up. If you can stop safely, you must. Proceed only if stopping would be unsafe (you're too close to stop).

Already in intersection when light turns red: Complete the turn — you are committed. Other traffic must wait for you to clear.

Backing out of a driveway: The reversing vehicle always yields to street traffic. You have no right of way in reverse.

Move Over law: When approaching a stopped emergency vehicle, tow truck, or other incident-response vehicle with flashing lights, you must immediately reduce your speed below the posted limit and proceed with caution. On a road with two or more lanes in your direction, you must change lanes when safe to do so (p.95).

Right turn on red: Legal ONLY after a complete stop and yielding to ALL traffic and pedestrians. Rolling right on red is illegal.

Left on red: Legal ONLY when turning from a one-way street onto another one-way street — after a complete stop and yielding.

🚥

Traffic Signal Meanings

ALWAYS TESTED

Signal	What You Must Do
Solid GREEN	Proceed — but yield to traffic already in intersection
Solid YELLOW	Prepare to stop if safe; proceed only if stopping would be dangerous
Solid RED	Stop completely; may turn right on red after stop and yield (unless posted)
GREEN ARROW	Protected turn — oncoming traffic must stop. You may turn in the arrow's direction, but still yield to vehicles and pedestrians already in the intersection.
YELLOW ARROW	Protected turn is ending — prepare to yield or stop
Flashing YELLOW ARROW	Unprotected turn — you MAY turn but MUST yield to oncoming and pedestrians
Flashing RED	Treat exactly like a STOP sign — stop, yield, proceed when safe
Flashing YELLOW	Caution — slow down and proceed carefully. Do not need to stop.
RED + GREEN ARROW	Stop for through traffic; turn in direction of arrow only
Signal NOT working	Treat as ALL-WAY STOP — all traffic stops

🛣️

Lane Markings — Know Each One

ON EXAM

Broken yellow center line: Passing is permitted from your side when it is safe.

Solid yellow line on your side: No passing from your side of the road.

Double solid yellow: No passing in either direction.

White lines: Separate traffic going in the same direction. Broken = lane change ok. Solid = discouraged (but not always illegal).

Yellow lines: Separate traffic going in opposite directions.

Center left-turn lane (two-way turn lane): Use ONLY to prepare for and make a left turn. Never use as a travel or passing lane.

Yellow X over a lane: Lane is CLOSED — move to a lane with a green arrow immediately.

White stop line: Stop your front bumper at or behind this line at intersections and crosswalks.

↔️

Safe Lane Changing Procedure

STEP BY STEP

Check your mirrors — rearview and side mirror on the side you're moving to

Signal your intent — give a continuous turn signal for at least 100 feet before a turn or lane change in business or residential areas; on freeways and highways, signal at least 5 seconds before lane change or exit (p.72, 85).

Look over your shoulder — physically check the blind spot. Mirrors cannot see everything.

Change lanes gradually — smooth and controlled, not jerky

Cancel signal and adjust speed to match the lane's traffic flow

🚨

DUI questions appear on virtually every DMV knowledge test. Know the BAC levels, implied consent law, and penalties. Idaho uses the term "DUI" (Driving Under the Influence).

🍺

DUI Laws — The Numbers You Must Know

ALWAYS ON TEST

Situation	Consequence
BAC of 0.08+ (driver 21+)	1st DUI conviction: up to 6 months jail, up to a $1,000 fine, license suspended 90–180 days with absolutely NO driving the first 30 days. A BAC of 0.20+ triggers enhanced penalties (p.131-132).
BAC of 0.04+ (commercial)	DUI threshold for any commercial-vehicle operator (p.131).
Test refusal (implied consent)	Driving in Idaho is implied consent to a BAC or drug test if suspected of DUI. 1st refusal: $250 civil penalty + 1-year absolute suspension. 2nd refusal in 10 years: 2-year absolute suspension (p.126-127).
BAC — under 21 (0.02 rule)	Drivers under 21 are DUI at a BAC of 0.02 or more. Idaho applies this strict standard regardless of whether driving is impaired (p.131).
Open container	Idaho's open-container law applies to BOTH drivers and passengers. Unsealed containers must be in the trunk or behind the last upright seat if there is no trunk (p.130).
Sobering up	Only the passage of TIME removes alcohol from your bloodstream. Coffee, food, exercise, and cold air do nothing (p.129).

💡

Critical DUI Facts to Remember

TESTED

Implied consent: By driving (or being in physical control of a vehicle) in Idaho, you have already consented to a BAC or drug test if law enforcement reasonably suspects DUI. Refusing the evidentiary test brings a $250 civil penalty plus a 1-year absolute suspension on a first refusal — 2 years for a second refusal within 10 years (p.126-127).

Only TIME removes alcohol: Coffee, food, cold showers, and fresh air do NOT lower your BAC. Your liver processes about 1 drink per hour — nothing speeds this up.

One drink ≈ one drink: A 12 oz beer, 5 oz glass of wine, and 1.5 oz shot of 80-proof liquor all contain about the same amount of alcohol — roughly one ounce. Judgment is the first driving ability affected (p.129).

Under-21 rule (0.02 BAC): Idaho drivers under 21 are DUI at a BAC of just 0.02 or more — far below the 0.08 adult limit. Commercial vehicle operators are DUI at 0.04 or more (p.131).

Mixing drugs and alcohol: Never drink alcohol while taking medications or other drugs. Combinations may multiply effects, reduce driving ability, and cause serious health problems or death. Having a prescription is not a defense if the medication impairs driving.

Texting law (all drivers): Reading, writing, or sending of written communication while driving is illegal in Idaho — an infraction. Hands-free use without either hand is exempt. Drivers who fail to give full attention may also be cited for inattentive driving (p.92, 43).

Drugs and driving: Driving while impaired by any drug — prescription, over-the-counter, or controlled — is illegal. Even legally prescribed medications that impair your ability to drive can lead to a DUI charge.

🚌

School bus rules are heavily tested. Traffic must stop and remain stopped while a school bus's red lights flash and/or its stop arm is extended — until the lights are off, the arm is in, and all children are clear of the roadway and the bus. Exception: traveling in the opposite direction on a 4+ lane highway with two lanes in each direction (p.70).

🚌

School Bus Stopping Rules

HEAVILY TESTED

Two-lane / undivided road: ALL traffic in BOTH directions must stop when a school bus has flashing red lights or the stop arm is extended (p.70).

Idaho exception — opposite direction on a 4+ lane highway: You do NOT have to stop if you are traveling the OPPOSITE direction on a highway with four or more lanes (two going each direction). Same-direction traffic must always stop (p.70).

Same direction — always stop: Traffic traveling in the same direction as the bus must ALWAYS stop, regardless of road type or number of lanes.

After the bus stops: Remain stopped until the bus resumes motion or deactivates its warning signals AND all loading/unloading passengers have cleared the roadway. Then proceed slowly, watching carefully for children near the roadway.

When may you proceed: Only when the red lights STOP flashing, the stop arm retracts, and the bus begins moving. It is unlawful to pass a stopped school bus while it is loading or unloading passengers.

Yellow lights = warning: Yellow flashing = bus is about to stop. Slow down immediately and prepare to stop. Do not try to pass before it stops.

School buses must stop at ALL railroad crossings — regardless of whether warning signals are active. This is federal law.

Passing a stopped school bus is always prohibited: Idaho law states passing is prohibited when a school bus is stopped to load or unload passengers (p.76). School-zone violations carry increased penalties (p.50, 69).

School safety patrols: You must follow any direction issued by a school safety patrol official while driving — they are authorized to display STOP and other directional signs at school crossings (p.48).

Speed Laws — What You Must Know

ON EVERY TEST

Basic Speed Law: Drive at a speed that is reasonable and proper for existing conditions — even if that means going below the posted limit. Rain, fog, heavy traffic, school zones all require reduced speed.

Posted limits are MAXIMUMS: You may never legally exceed a posted limit, regardless of conditions, traffic, or what other drivers are doing.

Minimum speed law: Do not drive so slowly that you impede or block the normal flow of traffic. Driving too slowly is also illegal.

Work zone caution: Violating a posted work-zone speed limit can result in an enhanced, fixed penalty in Idaho. The 15-mph passing-speed exception does NOT apply in work zones. Speeding, inattentive driving, failing to yield, and improper lane changes are leading causes of work-zone crashes (p.46-48, 69, 76).

Headlights and "over-driving them": Headlamps and tail lamps must be lit from sunset to sunrise AND any time visibility drops to 500 feet or less (rain, fog, smoke, dust). Use low beams in fog or heavy precipitation. Drive slow enough to stop within the distance you can see ahead — high beams must illuminate at least 350 ft, low beams at least 100 ft (p.38, 43, 108, 110).

Sight-distance rule for conditions: Pick a stationary object ahead and count your approach time. If you reach the object before the expected count — you are going too fast for the conditions. Slow down.

↔️

Following Distance — Idaho's 3-Second Rule

TESTED

Pick a fixed object — a sign, overpass, or lane marking ahead

When the car ahead passes it, start counting: "one-thousand-one, one-thousand-two, one-thousand-three"

If you pass the object before 3 seconds — you are following too closely. Slow down and increase the gap. In bad weather, multiply the 3-second rule several times (p.79).

💡 When to increase beyond the minimum

Rain, snow, ice, or fog → 4 seconds minimum
Driving at night → increase beyond the minimum
Following a large truck or motorcycle → 4+ seconds
Towing a trailer → 4 seconds minimum
Driving at highway speeds → increase distance proportionally

📐

Passing Rules

TESTED

✓

You MAY pass when: There is a broken yellow line on your side, you have sufficient sight distance, and there is no sign or condition prohibiting passing.

✗

NEVER pass: Within 100 feet of an intersection or railroad crossing; within 100 feet of a bridge or tunnel where the view is obstructed; in any no-passing zone (solid yellow on your side or "Do Not Pass" pennant); on a hill, curve, or other place with limited vision; when a school bus is loading or unloading; on the shoulder. Complete any pass before coming within 200 feet of oncoming traffic (p.76-78).

→

When it is safe to return: You may move back into your original lane when both headlights of the passed vehicle are visible in your rearview mirror.

→

Passing on the right: Legal when the vehicle ahead is making a left turn and there is a safe lane to the right, or on a multi-lane road.

🅿️

Parking Clearance Requirements

TESTED

Location	Minimum Clearance
Fire hydrant	15 ft — do not park within 15 ft (p.81)
Stop sign / yield sign / flashing signal / traffic control device	30 ft — do not park within 30 ft (p.81)
Crosswalk at intersection	20 ft — do not park within 20 ft (p.81)
Railroad crossing	50 ft — do not park within 50 ft of railroad tracks (p.81)
Fire station driveway	20 ft from the driveway entrance (p.81)
Parallel-park curb distance	Vehicle must be parallel and within 18 inches of the curb / edge of roadway (p.80)
Driveway entrance (public or private)	Not in front of — always prohibited
Accessible (handicapped) space	Never park here without a valid placard or plate. Idaho issues permanent disability placards/plates only with documented physician certification (p.28).
Inside an intersection or on a crosswalk	Never — always illegal
Bridge, overpass, or tunnel	Never — parking on bridges or overpasses is always prohibited in Idaho (p.81). Double-parking on the street side of any parked vehicle is also prohibited.
No Stopping zone	Never stop here, for any reason
No Parking zone	No parking — may stop to load/unload

⛰️

Parking on Hills — Wheel Position

TRICK QUESTION

💡

The rule: always turn wheels so that if the car rolls, it rolls away from traffic or is caught by the curb.

Situation	Turn Wheels	Why
Facing DOWNHILL, WITH curb	RIGHT (into curb)	Car rolls into curb and stops
Facing DOWNHILL, NO curb	RIGHT (away from road)	Car rolls away from traffic
Facing UPHILL, WITH curb	LEFT (away from curb)	Car rolls back, caught by curb
Facing UPHILL, NO curb	RIGHT (away from road)	Car rolls away from traffic

💡 Memory trick

Going downhill with a curb = wheels RIGHT into the curb
Going uphill with a curb = wheels LEFT, away from curb (tire catches it when rolling back)
No curb either way = wheels RIGHT, away from road

🎓

GDL questions appear on many tests. Know Idaho's Graduated Driver Licensing program, the restrictions in each phase, and the specific ages, hold periods, and curfew hours.

🎓

Idaho Graduated Driver Licensing (GDL)

ON EXAM

Phase 1 — Driver Training (DT) Permit (age 14½+)

→

Minimum age: 14½ and under 17. Must be enrolled in an approved driver training program. The DT permit is valid only to drive with an approved driver-training instructor (p.15).

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All applicants under 18 require a parent or legal guardian to sign as the liability signer. The signer assumes legal responsibility for the minor's driving and may withdraw consent at any time, which cancels the credential (p.26).

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Approved Driver Training: 30 hours of classroom + 6 hours behind-the-wheel with an approved instructor. Permit expires 5 days after the holder's 18th birthday (or 6 months for those 17½+) (p.15-16, 19).

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Texting while driving is illegal for ALL Idaho drivers — an infraction. Hands-free use without either hand is exempt. Inattentive driving is a separate citation (p.92, 43).

Phase 2 — GDL Supervised Period (SIP)

→

After completing Driver Training, you enter the supervised instruction period. Must be accompanied by a valid licensed driver at least 21 years of age in the front seat beside the driver (p.19).

→

Accumulate at least 50 hours of supervised driving (10 at night) over a minimum 6-month, violation-free period before becoming eligible for licensing (p.19).

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GDL penalties (under 17): 1st moving-violation conviction = warning letter; 2nd = 30-day suspension; 3rd+ = 60-day suspension (p.125).

Class D License — Under 17

→

May be licensed in Idaho at age 15 after completing approved Driver Training and the GDL supervised period (p.3).

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Under-16 daylight rule: may drive only between 5:00 a.m. and 10:00 p.m. local time. Outside daylight only with a valid licensed driver 21+ in the front seat beside you. Under-17 first-6-months rule: No more than ONE passenger under 17, unless related by blood, adoption, or marriage (p.16).

→

Class D Instruction Permit (IP) at age 17+: An alternative to the GDL track. Allows 6 months of practice when accompanied by an adult (18+) who holds a valid driver's license. Must pass the knowledge test (p.16).

🛡️

Emergency Situations — What to Do

TESTED

💨

Tire blowout: Hold the wheel FIRMLY. Ease off gas (don't brake suddenly). Let the car slow naturally. Then gently steer to safety. Sudden braking causes a spin.

💧

Hydroplaning: Ease off gas, hold wheel steady, avoid braking. Let tires re-contact the road. Don't jerk the wheel or brake hard.

🔥

Engine fire: Pull over immediately, turn off engine, get EVERYONE out and move far away (100+ feet). Call 911. Never open the hood.

⚡

Brakes fail: Shift to a lower gear. Use the parking brake gradually. Look for a safe area to slow to a stop. Rub a tire on the curb if needed.

🌊

Accelerator sticks: Shift to NEUTRAL immediately. Apply brakes. Pull over. Turn engine off.

🌀

Vehicle skids: Ease off gas and brakes. Steer in the direction you want the front to go (into the skid). Do not overcorrect.

🚂

Stalled on railroad tracks: Get everyone out immediately. Move away from the vehicle and the tracks. Locate the Emergency Notification System (ENS) sign for emergency contact information, and call for help — tell them a vehicle is on the tracks.

🌫️

Driving in fog: Use LOW beams (high beams reflect off fog and blind you). Slow significantly. Use fog lights if available. Consider pulling over.

😴

Drowsy driving: Only cure = sleep. Pull over and rest. Coffee, window down, and music are NOT effective solutions. Drowsy driving equals drunk driving in impairment level.

❄️

Stranded in a blizzard: Stay in the vehicle (it's shelter and visible). Run engine briefly for heat with window cracked to prevent CO poisoning. Signal for help with hazards.

🧠

Defensive Driving Principles

ESSENTIAL

Scan ahead: Look well ahead of your vehicle — at least a city block in town and farther on highways. Check mirrors every few seconds and whenever slowing, changing lanes, or approaching intersections.

Keep an escape route: Always know where you could go if the car ahead stopped suddenly.

Bridges freeze first: Cold air circulates above AND below a bridge. Bridges ice before road surface — always treat them as potentially icy in winter.

Head-on collision approaching: Brake hard and steer RIGHT — even off the road. A head-on crash at speed is almost always fatal; going off-road is survivable.

Road rage: Never engage, retaliate, or make eye contact. Don't respond with gestures. Slow down, create distance. Report to 911 if dangerous.

Front wheel off pavement: Don't jerk the wheel — it can roll the car. Ease off gas, brake gently, and gradually steer back. Hold on tight.

🔧

Vehicle Equipment Requirements

TESTED

Equipment	Requirement
Headlights (on)	Headlamps and tail lamps must be lit from sunset to sunrise, and any time visibility is 500 feet or less. Use headlamps — not parking lights — when lights are needed for driving (p.43, 110).
High beams (dim)	Dim within 500 feet of an oncoming vehicle, and within 200 feet when overtaking a vehicle ahead (p.43). Use low beams in fog, heavy rain, sleet, snow, or dust because high-beam light reflects off precipitation back into your eyes.
Horn	Use when needed to prevent a crash. Do NOT use to express anger, greet friends, or encourage others to move. Avoid around blind pedestrians and animal-drawn vehicles.
Turn signals	Signal at least 100 feet before a turn or lane change in business or residential areas. On freeways and highways: signal at least 5 seconds before lane change or exit. Use turn signals when changing lanes, passing, exiting a roundabout, turning at intersections or driveways, entering or leaving a freeway, or pulling away from / over to a curb (p.72, 85).
Studded snow tires	Permitted in Idaho only from October 1 to April 30. ITD may adjust dates due to weather. Studded tires are NOT allowed during the skills test from May 1 to September 30 (p.42, 36).
TVs / video screens visible to driver	Prohibited while vehicle is in motion (navigation is typically excepted — confirm against Idaho manual).
Muffler	Must prevent excessive or unusual noise
Brakes	Vehicles must have working service brakes capable of stopping under control. Parking brake required. Test brakes lightly after driving through deep water to dry them out.
Wipers	Must adequately clean the windshield when used
Tail lights / rear reflector	Tail lights and rear reflectors are required equipment on all vehicles. Keep lenses clean for night-driving visibility.
Tires	Tire condition and tread composition directly affect stopping distance. Proper inflation and good tread are critical.
Hazard lights	For use when parked/stopped in an emergency — not while driving normally
Seat belts & child restraints	Idaho law requires ALL occupants to wear safety belts and/or shoulder straps when riding in a vehicle equipped with them by the factory. Children 6 years of age or younger must be in approved child safety seats. Children under 13 should ride in the back seat (NHTSA). Rear-facing car seats must NEVER be in front of an active passenger air bag (p.40-41).

💡

Headlight Rules That Are Tested

TESTED

Headlights required by Idaho law: Headlamps and tail lamps must be lit from sunset to sunrise, and any time daytime visibility drops to 500 feet or less (rain, fog, smoke, dust). Use low beams in fog or heavy precipitation (p.43, 110).

Parking lights ≠ headlights: Parking lights are for indicating a parked vehicle only. Headlights are required for driving during the hours and conditions above — not parking lights.

Dim high beams: Within 500 feet of an oncoming vehicle and within 200 feet when overtaking a vehicle ahead (p.43). Also use low beams on lighted city streets, and in fog, heavy rain, sleet, snow, or dust because high-beam light reflects off precipitation back into your eyes.

Night driving — "drive in your headlights": Never drive faster than you can stop within the distance lit by your headlights. This is called over-driving your headlights and is dangerous.

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Before the Test — What to Do

PREPARATION

Take the DMV Exam Simulator at least 5 times and score 90%+ consistently. Don't go in when you're scoring 80% — aim higher than the minimum.

Use the "Weak Spots" mode the night before. Every question you got wrong — review those explanations until you understand WHY, not just what the answer is.

Memorize the Key Numbers tab — BAC limits, distances, suspension periods, speed limits. These are direct exam fodder.

Get a good night's sleep. Drowsy test-taking impairs recall just like drowsy driving impairs reaction time.

Bring required documents: Proof of identity (e.g., certified U.S. birth certificate or passport), Social Security number for verification, two proofs of Idaho residency (lease, utility bill, school records dated within 1 year), and proof of lawful presence if applicable. Under 18: a parent or legal guardian must be present to sign as the liability signer, plus a verification of school compliance (VOC). Under 17: proof of completed approved Driver Training and the supervised instruction period. Bring glasses/contacts if you wear them — vision standard is 20/40 in at least one eye (p.21-26, 32).

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During the Test — How to Answer

STRATEGY

The safest answer is usually correct. When in doubt, pick the option that is most cautious, most yields, or stops the most. Idaho tests reward safe, defensive driving choices.

Watch for "NEVER" and "ALWAYS" options. These are sometimes traps — but in driving law there are many absolute rules (ALWAYS stop for a school bus with flashing reds, NEVER pass on a hill crest, etc.).

"All of the above" is very often the correct answer on knowledge tests — especially for questions about DUI charges, suspension triggers, and violations.

Read every word. Test questions often hinge on words like "divided highway" vs. "undivided," "business district" vs. "residential," or "first offense" vs. "subsequent offense."

Refusing a BAC test costs your license. Idaho's implied-consent law: a 1st refusal brings a $250 civil penalty + 1-year absolute suspension. A 2nd refusal in 10 years = 2-year absolute suspension. Refusal does NOT protect you from consequences (p.126-127).

The real Idaho DMV knowledge test: 40 questions; you may miss up to 6 (about 85% / 34 correct to pass). Road signs are mixed with rules-of-the-road questions, not a separate section. No official time limit. Knowledge-test fee: $5. Failing requires a 3-day wait and another fee to retest (p.32, 5).

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Recommended Study Order

YOUR PLAN

Read Key Numbers tab — memorize every distance, speed, and BAC number

Read Right of Way + DUI tabs — the #1 and #2 failure topics

Read Road Signs + Signals tabs — shapes, colors, and signal meanings

Read School Buses + Parking tabs — specific rules with specific numbers

Take the Full Practice Bank — all available questions to identify weak spots

Use Weak Spots mode — drill every question you got wrong until you nail it

Run the DMV Exam Simulator 3–5 times — pass consistently with 90%+ before going in

Night before: Re-read the Key Numbers tab + Test-Day Tips tab. Good sleep. You've got this. ✅

📖 Idaho DMV Study Guide

Speed Limits

Critical Distances & Clearances

DUI & Alcohol Numbers

Teen / GDL Numbers

Following Distance & Time Rules

Sign Shapes — Each Shape Has One Meaning

Sign Colors — Color Tells You the Category

Signs That Are Frequently Confused

The Core Right-of-Way Rules

Right-of-Way Scenarios That Trick People

Traffic Signal Meanings

Lane Markings — Know Each One

Safe Lane Changing Procedure

DUI Laws — The Numbers You Must Know

Critical DUI Facts to Remember

School Bus Stopping Rules

Speed Laws — What You Must Know

Following Distance — Idaho's 3-Second Rule

💡 When to increase beyond the minimum

Passing Rules

Parking Clearance Requirements

Parking on Hills — Wheel Position

💡 Memory trick

Idaho Graduated Driver Licensing (GDL)

Emergency Situations — What to Do

Defensive Driving Principles

Vehicle Equipment Requirements

Headlight Rules That Are Tested

Before the Test — What to Do

During the Test — How to Answer

Top 10 Topics That Will Definitely Be on Your Test

Recommended Study Order

Ready to test what you've learned?

📖 Idaho DMV Study Guide

What to Study Before the Real Test

Speed Limits

Critical Distances & Clearances

DUI & Alcohol Numbers

Teen / GDL Numbers

Following Distance & Time Rules

Sign Shapes — Each Shape Has One Meaning

Sign Colors — Color Tells You the Category

Signs That Are Frequently Confused

The Core Right-of-Way Rules

Right-of-Way Scenarios That Trick People

Traffic Signal Meanings

Lane Markings — Know Each One

Safe Lane Changing Procedure

DUI Laws — The Numbers You Must Know

Critical DUI Facts to Remember

School Bus Stopping Rules

Speed Laws — What You Must Know

Following Distance — Idaho's 3-Second Rule

💡 When to increase beyond the minimum

Passing Rules

Parking Clearance Requirements

Parking on Hills — Wheel Position

💡 Memory trick

Idaho Graduated Driver Licensing (GDL)

Emergency Situations — What to Do

Defensive Driving Principles

Vehicle Equipment Requirements

Headlight Rules That Are Tested

Before the Test — What to Do

During the Test — How to Answer

Top 10 Topics That Will Definitely Be on Your Test

Recommended Study Order

Ready to test what you've learned?