Idaho Road Signs: 40-Question ITD Test, Open Range & School Bus Rules
How many questions are on the Idaho knowledge test and how many can you miss? What is the fee for the Idaho knowledge test? When are you not required to stop for a school bus on a 4-lane highway in Idaho? The Idaho Transportation Department at itd.idaho.gov gives a 40-question test. miss up to 6. The test fee is $5. You do not have to stop for a school bus when traveling in the opposite direction on a highway with four or more lanes if two lanes are going in each direction. Railroad stops are within 50 feet max, 15 feet minimum.
1. Idaho "Reasonable and Prudent" Speed Law and Why the 40-Question Knowledge Test Demands Full Prep
Idaho roads stretch from Boise urban grid and Nampas commercial corridors to the Snake River Canyon near Twin Falls, the Rocky Mountain passes above Idaho Falls and Pocatello, and the forested Panhandle highways near Coeur dAlene. The Idaho Transportation Department (ITD)knowledge test consists of 40 questions, you may miss up to 6 to pass. The test fee is $5.00. If you fail, you must wait 3 days to retest and pay the knowledge test fee again. Study the current Idaho Drivers Handbook (July 2026) at itd.idaho.gov. Idaho basic speed law requires driving at a speed that is "reasonable and prudent at all times", even below the posted limit when conditions demand it.
2. Identify Any Idaho Road Sign Before the Text: Shape and Color on the ITD Knowledge Exam
On Idaho high-speed interstates, blind mountain curves, and open Snake River Plain highways, you must read a signs shape and color before the text is legible. The Idaho ITD knowledge test specifically includes sign identification questions. master shape and color before your $5 test appointment.
Shape
Diagram
Meaning
Example Sign
Octagon (8-sided)
STOP. come to a complete stop, wheels fully stopped, check all directions, then proceed when clear
Triangle (inverted)
Yield slow down, check traffic; if clear proceed, if not stop and wait until safe to go
Diamond
Hazard ahead; slow down, stay alert, and be ready to stop or steer
Rectangle (vertical)
Regulatory information or instruction; obey the posted requirement
Rectangle (horizontal)
Informational sign; read it and use it to navigate or plan your route
Pentagon (5-sided)
School zone ahead; reduce speed and watch for children crossing
Round (circle)
Railroad crossing ahead; slow down, look both ways, and prepare to stop
Pennant
No passing zone; do not attempt to overtake any vehicle ahead
Orange (any shape)
Construction or work zone ahead; slow down, stay alert, and obey all posted signs
Blue (any shape)
Motorist services nearby; exit if you need fuel, food, or medical care
Brown (any shape)
Park or scenic area ahead; follow directional signs to reach it
3. Idaho Regulatory Signs: Moving Violations Under Idaho Point System and License Suspension Rules
Regulatory signs in Idaho must be obeyed. A moving traffic violation can add points under Idaho suspension and point violations system. Accumulate 12 or more points in 12 months and face a 30-day suspension; 24+ points in 36 months means a 6-month suspension. White rectangular signs, prohibitory signs, and lane-control signs are included in Idaho traffic-sign material.
STOP Sign
Come to a full stop and yield before proceeding
YIELD Sign
Slow down and give right-of-way; stop if needed before proceeding
Speed Limit Sign
Do not exceed this speed; adjust for road and weather conditions
Do Not Enter Sign
Entry prohibited; turn around or find an alternate route
Wrong Way Sign
You have entered a one-way road against traffic
No U-Turn Sign
U-turns are prohibited at this location
No Left Turn Sign
Do not turn left here; continue straight or turn right
No Right Turn Sign
Do not turn right here; continue straight or turn left
One Way Sign
All traffic flows one direction; do not enter going the wrong way
Keep Right Sign
Move to the right side of the island or obstruction
No Passing Zone Sign
Do not pass here; wait until the no-passing zone ends
Do Not Pass Sign
Do not overtake any vehicle ahead until passing is permitted again
No Turn on Red Sign
Wait for a green signal before turning; do not turn on red
No Left Turn on Red Sign
Wait for green before turning left; no turn on red permitted
No Right Turn on Red Sign
Wait for green before turning right; no turn on red permitted
Turn Left Only Sign
You must turn left from this lane; going straight is not allowed
Turn Right Only Sign
You must turn right from this lane; going straight is not allowed
Straight or Turn Right Sign
From this lane you may only go straight or turn right
Minimum Speed Limit Sign
You must drive at least this speed; move right if driving slower
Slower Traffic Keep Right Sign
Move to the right lane if you are driving slower than traffic
No Parking Sign
Parking prohibited here; find a legal parking area nearby
No Trucks Sign
Trucks prohibited on this road; use an alternate truck route
No Bicycles Sign
Cyclists must not enter; use an alternate route
No Pedestrian Crossing Sign
Pedestrians must not cross here; use the nearest crosswalk
Reserved Parking Sign
Park here only if you qualify; others must find a different spot
Four Way Stop Sign
Stop completely, then take turns in order of arrival
Stop Except Right Turn Sign
Stop fully before proceeding; right turns may go after stopping
Left Turn Yield on Green Sign
Yield to all oncoming traffic before completing your left turn
Lane Use Control Sign
Follow the sign; only the shown movement is permitted from this lane
Restricted Lane Ahead Sign
Check eligibility before entering; unauthorized use is a violation
4. Idaho Warning Signs: Hazards on Open Range Roads, Mountain Passes & Snake River Canyon Approaches
Diamond-shaped warning signs flag hazards before you reach them. on Idaho roads that means open range livestock crossings, steep mountain grades in the Sawtooth and Bitterroot ranges, blind curves on Panhandle roads, and wildlife corridors statewide. Orange signs mark active work zones where enhanced fines apply when posted. Idaho open range law means livestock have the right-of-way. If you strike livestock or domestic animals on open range, the owner is not liable for damage to you or your vehicle; you may be liable for the animal if you were negligent.
Left Curve
A curve to the left is ahead; reduce speed
Right Curve
A curve to the right is ahead; reduce speed
Sharp Left Turn
A very sharp left turn is ahead; slow down
Sharp Right Turn
A very sharp right turn is ahead; slow down
Winding Road
Multiple curves ahead; reduce speed and stay in your lane throughout
Set of Curves (Left-Right)
Multiple curves ahead curving left then right; reduce speed
Set of Curves (Right-Left)
Multiple curves ahead curving right then left; reduce speed
Sharp Turns (Left-Right)
Successive sharp turns ahead; slow down significantly
Slippery When Wet
Wet road is slippery; reduce speed and increase following distance
Deer Crossing
Animals frequently cross here; slow down and scan both sides of the road
Pedestrian Crossing
Crosswalk ahead; yield to any pedestrian in or entering the crosswalk
Bicycle Crossing
Cyclists cross here; slow down and yield before proceeding
School Zone / Crossing
Children may be present; slow to posted speed
School Crossing Ahead
School crosswalk ahead; yield to crossing guard and children
Divided Highway Begins
Road splits ahead; keep right and stay in your lane
Divided Highway Ends
Two-way traffic resumes ahead; stay right and watch oncoming traffic
Merging Traffic
Traffic is merging from another lane; adjust speed to allow safe entry
Added Lane
A new lane is added ahead; stay in your lane and let merging traffic in
Lane Ends Ahead
Your lane ends soon; check mirrors, signal, and merge now
Lane Ends Merge Left
Your lane ends; signal and move left before the lane disappears
Left Lane Ends
Left lane ends ahead; signal and move right before it closes
Road Narrows
Road gets narrower ahead; stay centered and reduce speed
Narrow Bridge Ahead
Bridge is narrower than the road; slow down and stay centered
Low Clearance
Overhead clearance is restricted; do not proceed if your vehicle is too tall
Railroad Crossing (RR)
Tracks ahead; slow down, look both ways, and stop if a train is coming
Hill / Steep Grade (Downgrade)
Steep hill ahead; reduce speed now and use a lower gear if needed
Bump
Speed bump ahead; slow down before reaching it
Dip
Dip in the road ahead; reduce speed to avoid bottoming out
Loose Gravel
Loose gravel on road; reduce speed and increase following distance
Pavement Ends
Paved surface ends ahead; slow down before the surface changes
Shoulder Drop Off
Edge of road drops steeply; stay away from the shoulder
Watch for Ice on Bridges
Bridge may be icy; reduce speed and avoid sudden braking or steering
Two Way Traffic Ahead
Divided road ends; move to the right and watch for oncoming traffic
Cross Road
Intersection ahead; slow down and scan left and right before crossing
Cross Traffic
Traffic crosses from both sides; slow down and be ready to yield or stop
T Intersection
Your road ends ahead; slow down and prepare to turn left or right
Side Road
A side road joins ahead; watch for vehicles entering from the right or left
Highway Intersection Ahead
A major intersection is approaching; reduce speed and be ready to yield
Road Entering Curve
A road merges on a curve ahead; watch for vehicles entering
Roundabout
Yield to traffic already in the roundabout; then enter and keep right
Truck Rollover
Trucks must slow significantly; high rollover risk on this curve
Weave Area
Lanes are entering and exiting; stay alert, check mirrors, and adjust speed
Advisory Speed
Safe speed for this curve; slow to the posted advisory speed
Traffic Signal Ahead
A traffic light is ahead; reduce speed and be ready to stop
Guide signs do not regulate driving. they show destinations, distances, and services. Green = highway navigation. Blue = motorist services. Brown = parks and recreation. Idaho 511 Traveler Services (dial 511 or visit 511.idaho.gov) provides real-time road conditions, closures, and weather information statewide.
Interstate Route Marker
You are on this interstate highway; note the number for navigation
US Route Marker
You are on this US highway; note the number for navigation
State Route Marker
You are on this state route; note the number for navigation
Exit Sign (Exit Only)
This lane becomes exit-only; move out of it if you are not exiting
Mile Marker
Marks your location on the route; note it for emergency or navigation use
Services Sign
Services available at next exit; move right if you need to stop
Hospital Sign (H)
Hospital is nearby; follow signs if you need emergency care
Diesel
Diesel fuel available ahead; exit if your vehicle needs it
Park / Recreation Sign
Park or recreation area nearby; exit and follow directional signs
6. Idaho Traffic Signals: Power Outages, Arrow Phases & What the ITD 40-Question Exam Tests
Flashing red = stop. What does a flashing yellow light mean in Idaho? Flashing yellow means caution: slow down, look carefully for hazards, and proceed with caution. A flashing yellow arrow allows a turn after yielding to oncoming traffic and pedestrians in crosswalks. If traffic signals are not functioning, treat the intersection as a four-way stop.
Standard Traffic Lights
Steady Red
Stop completely; a turn on a steady red circular light may be allowed after stopping and yielding unless a sign prohibits it
Steady Yellow
Slow down and prepare to stop; do not speed up to beat the light
Steady Green
Proceed when clear; if turning left, yield to oncoming traffic and pedestrians in crosswalks
Green Arrow (left)
Proceed only in the arrow direction; yield to pedestrians
Solid Yellow Arrow
The turn signal is changing; stop if you can do so safely, or clear the intersection if already in it
Red Arrow (no left)
Do not turn in the arrow direction; wait for the green arrow
Circular Green (no arrow)
Proceed; if turning left, yield to oncoming traffic and pedestrians in crosswalks
Opposing Traffic Extended Green
Oncoming traffic still has green; wait and do not turn left yet
Flashing Signals
Flashing Red
Treat as a stop sign; stop fully, then proceed when safe and clear
Flashing Yellow
Slow down, check for hazards, and proceed with caution
Flashing Red Beacon
Treat the overhead beacon as a stop sign
Flashing Yellow Arrow
Turn in the arrow direction only after yielding to oncoming traffic and pedestrians in crosswalks
Pedestrian Signals
WALK / White Walking Figure & DONT WALK / Orange Hand
White figure = cross now; orange hand = do not start crossing
Flashing Orange Hand + Countdown
Crossing phase ending; finish if started, do not begin
Idaho HAWK / Pedestrian Hybrid Beacon: The beacon is dark until activated by a pedestrian, then changes through flashing yellow, solid yellow, solid red, and alternating flashing red. On alternating flashing red, stop, yield to pedestrians in the crosswalk, and proceed when the crosswalk is clear.
Key test point: Flashing red = stop. Flashing yellow = proceed with caution. A flashing yellow arrow permits the turn after yielding. When traffic signals are not functioning, treat the intersection as a four-way stop.
Yellow lines separate opposing traffic. White lines separate same-direction traffic. The Idaho knowledge test covers lane lines, road arrows, curb markings, and pavement symbols. including Idaho shared center turn lane rules and the dashed bike lane line rules at intersections.
Line Colors
Yellow lines
Separate opposing traffic; never cross a solid yellow line to pass
White lines
Mark your lane boundaries; stay within the white lines
Line Types
Broken yellow line (Single)
You may pass on your side if it is safe and clear ahead
Solid yellow + broken yellow
Pass only from the broken-line side when it is safe; do not pass from the solid side
Double solid yellow lines
Passing is not allowed in either direction; you may cross the double yellow lines to make a left turn into or out of a driveway or business entrance when safe
Broken white line
You may change lanes if it is safe; always check mirrors and signal first
Solid white line
Avoid changing lanes where a solid white line separates lanes moving in the same direction; solid white lines are also used for roadway edges and other markings
Double solid white lines
Do not change lanes here; stay in your current lane
Center Turn Lane
For left turns only; signal, enter the lane, and turn; do not use it to travel
Center Turning Lane (sign)
For left turns only; signal, enter, and turn; do not drive through it
Pavement Symbols & Special Markings
Arrows in lane
You must follow the arrow direction from this lane
Stop line (wide white bar)
Stop completely behind this line; do not roll past it
Stop Here on Red
Stop at this painted line; do not inch forward past it
Crosswalk lines
Pedestrian crossing zone; always yield to pedestrians here
Broken white line (pavement)
You may change lanes if it is safe; check mirrors and signal first
Solid white line (pavement)
Avoid changing lanes where a solid white line separates lanes moving in the same direction; solid white lines are also used for roadway edges and other markings
Double solid white lines (pavement)
Do not change lanes here; stay in your current lane
Railroad crossing markings (X + RR)
Tracks ahead; slow down, look both ways, and be ready to stop
Diagonal yellow lines (gore area)
Do not enter or drive through this area; it is off-limits to traffic
Bicycle lane marking
Reserved for cyclists only; do not drive or park in this lane
HOV / Carpool lane diamond
Use this lane only if you have the required number of occupants
Yellow curb
Follow posted local parking signs; Idaho does not assign one statewide yellow-curb meaning in the Driver’s Handbook
Red curb
Do not stop, stand, or park here at any time
White curb
Follow posted local parking signs; Idaho does not assign one statewide white-curb meaning in the Driver’s Handbook
Key test point: Yellow center lines separate opposing traffic, while white lane lines separate traffic moving in the same direction. A dashed yellow line may be crossed to pass when safe; double solid yellow lines prohibit passing but may be crossed for a safe left turn into or out of a driveway or business entrance.
8. Idaho Work Zone Signs: Enhanced Penalties, Slow-Moving Equipment & ITD Construction Zones
Orange signs with black lettering mark active construction and maintenance work zones on Idaho roads. When signs indicate enhanced fines are in effect, fines for speeding violations are increased in designated work zones. School safety patrols, flaggers, and law enforcement officers may all direct traffic through Idaho work zones and must be obeyed immediately.
Road Work Ahead
Construction zone begins ahead; reduce speed and stay alert
Flagger Ahead
A person is directing traffic; obey their signals
Workers Ahead
Road workers are present; slow down and be ready to stop
Active Work Zone
You are in an active work zone; drive with extra caution
End of Active Work Zone
Work zone ends; resume normal speed and check posted limit
Lane Closed Ahead
A travel lane ends ahead; merge early
Road Closed
Road is completely closed; follow detour signs
Orange barrels / cones
Active work zone boundaries; stay within marked lanes
Channelizing devices (barricades)
Follow the barricades; do not drive through or around them
You must obey a flaggers directions even if they conflict with existing signs or signals.
When work zone signage indicates enhanced penalties, fines for speeding violations are increased in that designated zone.
Watch for slow-moving vehicles and farm equipment in Idaho work zones and on rural highways. the orange triangular slow-moving vehicle emblem means the vehicle travels at 25 mph or less.
When approaching a stopped emergency or police vehicle with lights flashing, or a tow truck or incident response vehicle, reduce speed below the posted limit and proceed with caution. On a road with two or more lanes in the same direction, change to a nonadjacent lane as soon as safely possible.
Never drive through or around a closed lane barrier. follow flagger directions or posted detour signs.
Key test point: Orange-and-black warning signs identify work-zone and temporary traffic-control hazards. Slow down, watch for changing lanes or road conditions, and follow flaggers, barriers, and posted signs.
9. Railroad Crossings in Idaho: The 50-Foot and 15-Foot Stop Rules Tested on the Knowledge Exam
When approaching a railroad grade crossing in Idaho, you must stop within 50 feet but no less than 15 feet from the nearest rail when required. This specific distance range is included in Idaho practice test questions and is directly tested on the knowledge exam. Never shift gears on the crossing. you might stall.
Stop Line
Stop here completely when required before proceeding
RR Crossbuck Sign (X-shaped)
Located at the crossing; yield to trains
Railroad Crossing (at crossing)
You are at the crossing; stop if lights flash or gate lowers
Crossing Gates
Lower when a train is coming; never drive around a lowered gate
Pavement markings (X + RR)
Tracks ahead marked on pavement; slow down and prepare to stop
Flashing Red Lights
A train is approaching; stop and wait until fully clear
The round yellow advance warning sign warns that a railroad crossing is ahead.
Stop within 50 feet but no less than 15 feet from the nearest rail when required. this exact range is tested in Idaho practice exam questions.
Never shift gears when crossing railroad tracks. stalling on the tracks is extremely dangerous.
Never stop on the tracks. ensure there is room on the far side before proceeding across.
Never drive around or under a lowered crossing gate. it is illegal in Idaho.
Watch for a second train after one passes. do not proceed until you are sure no train is approaching on another track.
Vehicles carrying hazardous materials must stop at all railroad crossings. The Idaho Driver’s Handbook also warns that some buses and trucks are required to stop at all railroad crossings.
The blue Emergency Notification System (ENS) sign at or near a railroad crossing lists the railroad phone number and crossing-identification information for emergencies or warning-device malfunctions.
Key test point: Idaho railroad stop rule, within 50 feet but no less than 15 feet from the nearest rail. is included in Idaho official practice test (Question 18). Know both the minimum and maximum distances.
10. Idaho School Zone Speed Limits and School Bus Stop Rules: What the Practice Test Actually Asks
Pentagon-shaped, fluorescent yellow-green signs mark school zones exclusively. Idaho sets increased penalties for speeding violations in school zones. posted signage indicates when enhanced fines apply. Idaho school bus stop rules are directly tested in the official practice exam. Question 4 asks exactly when you are not required to stop.
School Zone
School ahead; reduce speed and watch for children
School Speed Limit
Obey the reduced speed limit posted in school zones
Speed Limit Lights Flashing
Obey the posted speed limit only when the lights are flashing
School Crossing Ahead
School crosswalk ahead; yield to crossing guard and children
Idaho sets increased penalties for speeding violations in school zones. posted signs indicate when enhanced fines are in effect.
You must stop for a school bus when the red lights near the top of the bus are flashing and/or the stop arm on the left side is extended. remain stopped until all children are clear of the roadway and the bus resumes motion.
Traffic must stop when approaching a school bus that has stopped to pick up or drop off children.
You do not have to stop if you are traveling in the opposite direction on a highway with four or more lanes where two lanes are going in each direction. this is Idaho Practice Test Question 4.
Always obey school safety patrol officials. they are appointed by the school, wear appropriate insignia marked "School Patrol," and display STOP signs at school crossings. You must follow their directions.
Slow down and watch carefully in school zones. children are often unpredictable pedestrians and difficult to see.
Key test point: The pentagon shape is used exclusively for school signs. No other sign category uses this shape. making it one of the easiest shapes to identify on the exam.
11. Pedestrian & Bike Signs in Idaho: Sharing Mountain Roads, Bike Lane Rules & Open Range Awareness
Motor vehicles must yield to pedestrians in marked or unmarked crosswalks at intersections. The Idaho Driver’s Handbook says a safe passing margin around bicyclists is at least 3 feet. Bicyclists in Idaho do not need to come to a complete stop at stop signs but must yield to vehicles already at or in the intersection. Fluorescent yellow-green may be used for pedestrian, bicycle, and school warnings.
Pedestrian Crossing Sign
Crosswalk ahead; yield to any pedestrian in or entering the crosswalk
Bicycle Crossing Sign
Cyclists cross here; slow down and yield before proceeding
No Bicycles
Cyclists must not enter; use an alternate route
No Pedestrian Crossing
Pedestrians must not cross here; use the nearest crosswalk
Motor vehicles must yield to pedestrians in marked or unmarked crosswalks at intersections. Pedestrians must yield when crossing where there is no crosswalk or intersection or when directed by a traffic signal.
Pass bicyclists with a safe clearance. move into the left lane if possible; if not, allow at least 3 feet of space. Wait for a break in oncoming traffic if needed on two-lane roads.
Idaho law allows bicyclists to proceed through a red light after stopping and yielding to vehicles already in or approaching the intersection. they do not need to come to a complete stop at stop signs, but must yield right-of-way.
Dashed bike lane lines at intersections indicate a merging movement. when turning right, you may enter the bike lane in the dashed area. Yield to any bicyclist already there.
Fluorescent yellow-green may be used for school, pedestrian, and bicycle warning signs.
Bicycles May Use Full Lane signs and shared-lane markings may be used where bicyclists are likely to occupy the travel lane. Green pavement in bicycle lanes highlights places where bicycle and vehicle movements cross.
Key test point: In Idaho, motorists must yield to pedestrians in marked or unmarked crosswalks at intersections. Where there is no crosswalk or intersection, pedestrians must yield to motor vehicles.
12. How to Score 34/40 on Idaho ITD Knowledge Exam: Signs & Key Laws
40 questions, miss up to 6. The Idaho knowledge test has 40 questions. you may miss no more than 6 to pass. The fee is $5.00. If you fail, you must wait 3 days to retest and pay the knowledge test fee again.
Know Idaho basic speed law word for word. Idaho basic rule requires driving at a speed that is "reasonable and prudent at all times", even below the posted limit in poor conditions. Practice Test Question 13 tests this exact rule.
Idaho speed limits. Max on interstates: 75 mph (80 where posted). State highways: 65 mph (70 where posted). Residential/business/urban districts: 35 mph unless otherwise posted. Driving too slowly and impeding traffic is also a violation.
School bus: know the 4-lane exception. You do NOT have to stop for a school bus if you are traveling in the opposite direction on a highway with four or more lanes where two lanes go in each direction. Practice Test Question 4.
Railroad: 50 feet max, 15 feet minimum. Stop within 50 feet but no less than 15 feet from the nearest rail. Practice Test Question 18. Both distances are tested.
Power outage = four-way stop. When traffic signals are not functioning due to a power outage, treat the intersection as a four-way stop. Practice Test Question 7.
Passing on the right. Legal only when the vehicle ahead on a two-lane road is signaling to turn left, or on a one-way or multi-lane road. Practice Test Question 2.
Bicyclists have unique Idaho rules. They may proceed through red lights after stopping and yielding, and through stop signs after yielding. without coming to a complete stop.
Open range means livestock have right-of-way. Outside city limits, livestock may roam freely. If you strike an animal on open range and are found negligent, you may be liable for the animals injuries or death.
Use Idaho 511 Traveler Services. Dial 511 or visit 511.idaho.gov for real-time road conditions, closures, and mountain pass weather before any trip on Idaho highways.
Looking for a quick reference to study Idaho road signs? This guide covers everything included in the Idaho DMV road signs PDF -- from Idaho regulatory signs and warning signs to pavement markings and traffic signals. Use it as your Idaho road signs summary, Idaho printable road signs chart, or complete Idaho road sign list with meanings for your driver knowledge test prep.
Students also use this page as a Idaho road signs study guide, Idaho traffic signs cheat sheet, Idaho road sign recognition test tool, and Idaho official road signs reference sheet before their Idaho written exam. Whether you need a Idaho traffic signs PDF, a Idaho road signs quick review, or a Idaho DMV sign test study sheet, this page has you covered.
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