Idaho: Traffic signals Practice Test
Red, yellow and green lights, arrows, flashing signals, pedestrian signals and hybrid beacons.
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Questions are original and based on the official manual "Idaho Driver's Handbook" (July 2026), Idaho Transportation Department.
All 22 questions in this practice test
Take the test above first, then use this list to study. Tap “Show answer” to see the correct answer and explanation.
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Where is the red light on a vertical traffic light?
- In the middle
- At the bottom
- On the far right
- At the top
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Correct answer: At the top
Vertical traffic lights have a red light at the top, a yellow light in the middle, and a green light at the bottom.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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Where is the red light on a horizontal traffic light?
- In the middle
- On the far left
- On the far right
- At the top
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Correct answer: On the far left
Horizontal traffic lights have a red light on the far left, yellow in the middle, and green on the far right.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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Where must you stop when a steady red circular light is shown?
- Anywhere inside the intersection, as long as you stop
- Before you reach the stop line, crosswalk, or intersection
- Past the crosswalk but before the other traffic lanes
- Only at the stop line when one is painted, never earlier
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Correct answer: Before you reach the stop line, crosswalk, or intersection
A steady red circular light means stop, and you must come to a complete stop before reaching the stop line, crosswalk, or intersection.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What must you do at a flashing red light?
- Slow down and proceed if no vehicles are in sight on the cross street
- Stop only if cross traffic is approaching, otherwise continue through
- Stop and wait at the stop line until the light turns green for you
- Stop completely, yield to cross traffic or pedestrians, and then go when clear
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Correct answer: Stop completely, yield to cross traffic or pedestrians, and then go when clear
A flashing red indication means stop, then yield to cross traffic or pedestrians and proceed when clear.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What does a steady red arrow mean?
- No turn in the arrow's direction until a green or yellow light allows it
- You may turn in the direction of the arrow after yielding to traffic
- You may turn in the direction of the arrow after a complete stop
- The lane under the arrow is closed and you must change lanes
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Correct answer: No turn in the arrow's direction until a green or yellow light allows it
While the steady red arrow is displayed, no turn is permitted in the direction of the arrow until a green or yellow indication allows movement.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What does a yellow (amber) circular light warn?
- That the signal is changing to green
- That a pedestrian is crossing ahead
- That the signal is about to change to red
- That the traffic signal is out of order
Show answer
Correct answer: That the signal is about to change to red
An amber or yellow circular indication warns that the signal is about to change to red.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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A yellow light comes on before you enter the intersection and you can stop safely. What should you do?
- Stop
- Continue through the intersection at the same speed
- Speed up to clear the intersection before the red
- Slow down and wait inside the crosswalk
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Correct answer: Stop
If you have not entered the intersection and can come to a safe stop, you should do so.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What should you do if the light turns yellow when you are already in the intersection?
- Stop immediately where you are
- Back up behind the stop line
- Continue moving and clear it safely
- Wait in the intersection until the light is green again
Show answer
Correct answer: Continue moving and clear it safely
If you are already in the intersection, you should continue moving and clear it safely.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What does a flashing circular yellow light mean?
- Stop completely and wait for a green light before moving on
- Slow down, look carefully for hazards, and proceed with caution
- Stop and proceed when the way is clear of all cross traffic
- Yield only to vehicles approaching from your right side
Show answer
Correct answer: Slow down, look carefully for hazards, and proceed with caution
A flashing circular yellow indication means caution: slow down, look carefully for hazards, and proceed with caution.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What does a solid yellow arrow mean?
- Turns are allowed after yielding to oncoming traffic
- Turns in the direction of the arrow are not allowed
- The signal for the turn has just turned green
- The signal for the turn is changing
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Correct answer: The signal for the turn is changing
The solid yellow indication with an arrow means the signal for the turn is changing.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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The light shows a solid yellow arrow and you are already in the intersection. What should you do?
- Stop where you are until the arrow turns green
- Back up to the stop line
- Continue the turn and clear the intersection safely
- Go straight through instead of turning
Show answer
Correct answer: Continue the turn and clear the intersection safely
If you are already in the intersection, you should continue the turn and clear the intersection safely.
Source: Idaho Driver's Handbook (July 2026), page 55 · Open this page in the manual (Manual page 55)
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What does a flashing yellow arrow mean?
- Turns are allowed after yielding to oncoming traffic and pedestrians in crosswalks
- Turns are not allowed until the arrow turns green and oncoming traffic stops
- You must stop first and then turn when it is clear of oncoming traffic
- Oncoming traffic must yield to you while you complete your left turn
Show answer
Correct answer: Turns are allowed after yielding to oncoming traffic and pedestrians in crosswalks
The flashing yellow arrow means turns are allowed after yielding to oncoming traffic and pedestrians in crosswalks.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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You are in the left-turn lane and the light is a green circle. What must you do before turning left?
- Stop and wait for a green arrow before you turn left
- Turn first because you have the green light to go
- Yield only to vehicles that are behind you in line
- Yield to oncoming traffic and pedestrians in crosswalks
Show answer
Correct answer: Yield to oncoming traffic and pedestrians in crosswalks
On a green circular light in the left-turn lane, you must yield to oncoming traffic and pedestrians in crosswalks before turning left.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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When should you not enter an intersection, even with a green light?
- When pedestrians are waiting at the far corner of the intersection
- When there is no room on the other side for your vehicle to clear it
- When the cross traffic has a flashing yellow light facing it
- When the vehicle ahead of you is signaling a turn
Show answer
Correct answer: When there is no room on the other side for your vehicle to clear it
You should not enter the intersection unless there is sufficient space on the other side for your vehicle to completely pass through, so you are not blocking it.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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For what is the doghouse signal most commonly used?
- To indicate protected right turns
- To indicate protected left turns
- To mark a school zone crossing
- To control traffic entering a freeway
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Correct answer: To indicate protected left turns
The doghouse signal is most commonly used to indicate protected left turns.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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What does the yellow light on a doghouse signal indicate?
- That the protected left turn is about to begin
- That oncoming traffic has the right-of-way
- That you must stop and yield before turning
- That the protected left turn movement is ending
Show answer
Correct answer: That the protected left turn movement is ending
The yellow light on the doghouse signal indicates that the protected left turn movement is ending.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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How should you treat an intersection where the traffic signal is not functioning?
- As a four-way stop
- As an intersection with a yield sign
- As a flashing yellow light intersection
- As an intersection where the main road has priority
Show answer
Correct answer: As a four-way stop
Whenever a traffic signal is not functioning, you treat the intersection as a four-way stop.
Source: Idaho Driver's Handbook (July 2026), page 56 · Open this page in the manual (Manual page 56)
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What does a flashing red traffic signal indication mean?
- Slow down and proceed with caution
- It is the same as a stop sign
- The light is about to turn green
- Yield, stopping only if traffic is near
Show answer
Correct answer: It is the same as a stop sign
Idaho law requires you to stop for any flashing red indication; it is the same as a stop sign.
Source: Idaho Driver's Handbook (July 2026), page 69 · Open this page in the manual (Manual page 69)
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You are stopped at a steady red arrow. When may you make a turn in the direction of the arrow?
- After stopping and yielding to cross traffic
- Whenever no pedestrians are in the crosswalk
- After a full stop of three seconds
- When a green or yellow light allows movement
Show answer
Correct answer: When a green or yellow light allows movement
A steady red arrow is the same as a stop sign, and you may not turn at the red arrow until a green or yellow light indication allows movement.
Source: Idaho Driver's Handbook (July 2026), page 69 · Open this page in the manual (Manual page 69)
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You stop for a steady red light at an intersection with no stop line. Where must you stop?
- Before entering the crosswalk
- Just past the crosswalk
- In the crosswalk, past the curb line
- Beside the traffic signal pole
Show answer
Correct answer: Before entering the crosswalk
At a steady red light you remain stopped behind the stop line; if there is no stop line, you stop before entering the crosswalk.
Source: Idaho Driver's Handbook (July 2026), page 69 · Open this page in the manual (Manual page 69)
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At a steady red light, with no sign saying otherwise, may you turn right?
- No, you must wait for a green light
- Yes, without stopping if the way is clear
- Yes, after stopping and yielding to cross traffic
- Only if a green arrow points to the right
Show answer
Correct answer: Yes, after stopping and yielding to cross traffic
At a steady red light you may turn right after stopping and yielding to cross-traffic, except where posted otherwise.
Source: Idaho Driver's Handbook (July 2026), page 69 · Open this page in the manual (Manual page 69)
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A green arrow is shown along with a steady red light. What may you do?
- Go straight or turn in any direction
- Proceed only in the direction of the green arrow
- Wait until the red light turns green
- Proceed in any direction once it is clear
Show answer
Correct answer: Proceed only in the direction of the green arrow
When a green arrow is shown along with a steady red indication, you may proceed only in the direction of the green arrow.
Source: Idaho Driver's Handbook (July 2026), page 69 · Open this page in the manual (Manual page 69)