Iowa: Traffic signals — Part 2 Practice Test
Questions in this part include: “Over a reversible lane there is a flashing yellow "X". What does it mean?” · “At a signal on a ramp at a diverging diamond interchange, what may you do on a red light?”
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Questions are original and based on the official manual "Iowa Driver’s License Manual" (July 2026), Iowa Department of Transportation.
All 16 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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Over a reversible lane there is a green arrow. What does it mean?
- The lane is only for turning
- The use of the lane is changing
- You may not use the lane
- You can use the lane beneath it
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Correct answer: You can use the lane beneath it
A green arrow over a reversible lane means you can use the lane beneath it.
Source: Iowa Driver’s License Manual (July 2026), page 15
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Over a reversible lane there is a red "X". What does it mean?
- You can use the lane beneath it
- You may not use the lane
- The lane is only for turning
- You should move out of the lane as soon as it is safe
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Correct answer: You may not use the lane
A red "X" over a reversible lane means you may not use that lane.
Source: Iowa Driver’s License Manual (July 2026), page 15
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Over a reversible lane there is a flashing yellow "X". What does it mean?
- The lane is only for turning
- The lane is open to all traffic
- You may not use the lane
- The lane is reserved for high-occupancy vehicles
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Correct answer: The lane is only for turning
A flashing yellow "X" over a reversible lane means the lane is only for turning.
Source: Iowa Driver’s License Manual (July 2026), page 15
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Over a reversible lane there is a steady yellow "X". What should you do?
- Use the lane only for turning
- Stop and wait in the lane until the signal changes
- Move out of the lane as soon as it is safe to do so
- Speed up to clear the lane before it closes
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Correct answer: Move out of the lane as soon as it is safe to do so
A steady yellow "X" means the use of the lane is changing, so you should move out of it as soon as it is safe to do so.
Source: Iowa Driver’s License Manual (July 2026), page 15
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How is a Rectangular Rapid Flashing Beacon activated?
- Manually, by a push button
- By sensors that detect approaching vehicles
- By a timer that runs all day long
- By a signal from the nearest traffic light
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Correct answer: Manually, by a push button
Rectangular Rapid Flashing Beacons are manually activated by a push button.
Source: Iowa Driver’s License Manual (July 2026), page 18
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Where are Rectangular Rapid Flashing Beacons often located?
- Only at busy intersections that already have traffic signals
- At roundabout exits and on freeway interchange ramps
- At intersections without traffic signals or at mid-block crosswalks
- Only at railroad crossings and in school parking lots
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Correct answer: At intersections without traffic signals or at mid-block crosswalks
They are often located at intersections without traffic signals or at mid-block crosswalks.
Source: Iowa Driver’s License Manual (July 2026), page 18
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What do the lights of a Rectangular Rapid Flashing Beacon look like when the beacon has been activated?
- Red lights that flash in a slow pattern
- Amber lights that flash in a rapid pattern
- White lights that stay on steadily
- Green lights that alternate with red
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Correct answer: Amber lights that flash in a rapid pattern
When activated, a Rectangular Rapid Flashing Beacon flashes amber lights in a rapid pattern.
Source: Iowa Driver’s License Manual (July 2026), page 18
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When do Pedestrian Hybrid Beacons operate?
- Only when a pedestrian activates them
- Only during morning and evening rush hours
- At all times, day and night
- Only when cars are waiting at the crosswalk
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Correct answer: Only when a pedestrian activates them
Pedestrian Hybrid Beacons operate only when they are activated by a pedestrian.
Source: Iowa Driver’s License Manual (July 2026), page 18
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What should motorists do when all the lights of a Pedestrian Hybrid Beacon are dark?
- Stop and wait for the lights to come on
- Treat the crossing as an all-way stop
- Proceed with caution
- Speed up to clear the crossing quickly
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Correct answer: Proceed with caution
When all lights of a Pedestrian Hybrid Beacon are dark, motorists can proceed with caution.
Source: Iowa Driver’s License Manual (July 2026), page 18
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The bottom yellow light of a Pedestrian Hybrid Beacon is flashing. What must motorists do?
- Maintain your speed
- Slow down
- Speed up to clear it
- Change lanes
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Correct answer: Slow down
Once the beacon is activated, the bottom yellow light flashes and motorists must slow down.
Source: Iowa Driver’s License Manual (July 2026), page 18
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The bottom yellow light of a Pedestrian Hybrid Beacon has become solid. What must motorists do?
- Continue at the same speed
- Speed up to clear the crosswalk
- Pull over to the right and wait
- Prepare to stop
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Correct answer: Prepare to stop
When the bottom yellow light becomes solid, motorists must prepare to stop.
Source: Iowa Driver’s License Manual (July 2026), page 18
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The top two red lights of a Pedestrian Hybrid Beacon have become solid. What must motorists do?
- Stop for pedestrians
- Slow down and proceed with caution
- Continue if no one is crossing
- Speed up to pass before anyone crosses
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Correct answer: Stop for pedestrians
When the top two red lights become solid, motorists must stop for pedestrians.
Source: Iowa Driver’s License Manual (July 2026), page 18
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The top two red lights of a Pedestrian Hybrid Beacon are flashing. Under what condition may motorists proceed with caution?
- Only after the lights have all gone dark
- Only after the bottom yellow light flashes again
- After stopping, if the crosswalk is clear
- Only after a pedestrian waves them through
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Correct answer: After stopping, if the crosswalk is clear
When the two red lights flash, motorists must stop if they have not already done so, and may then proceed with caution if the crosswalk is clear.
Source: Iowa Driver’s License Manual (July 2026), page 18
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What must you do at a flashing red light?
- Stop, then go ahead if it is clear
- Slow down and go through without stopping
- Stop and wait until it turns green
- Yield only if cross traffic is present
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Correct answer: Stop, then go ahead if it is clear
At a flashing red light you must stop, then go ahead if it is clear.
Source: Iowa Driver’s License Manual (July 2026), page 41
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At a signal on a ramp at a diverging diamond interchange, what may you do on a red light?
- After stopping first, turn left or right on red when the road is clear
- Go straight through the red light if no vehicles are visible
- Wait for a green light, because turns on red are never allowed
- Turn on red without stopping when the road is clear
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Correct answer: After stopping first, turn left or right on red when the road is clear
The signs on the interchange diagram say to stop first and then turn right or left on red if the road is clear.
Source: Iowa Driver’s License Manual (July 2026), page 53
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At a diverging diamond interchange, what does an up arrow on a traffic signal indicate?
- Turning around
- Merging onto the interstate
- Driving straight through
- Exiting the roadway
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Correct answer: Driving straight through
Some signals at this interchange have arrows for left or right turns and up arrows to indicate driving straight through.
Source: Iowa Driver’s License Manual (July 2026), page 53