California DMV Permit Test · Class C Knowledge Test
California DMV Permit Test: Signs, Signals, and Pavement Markings Concepts
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Overview
This chapter is about reading the road. Traffic lights, signs, and painted lines all give you orders or warnings, and the test checks whether you know what each one means. Most of the rules come down to a few simple patterns: the color, the shape, and whether a light is steady or flashing.
Lights come first. A steady red means stop and wait, but a flashing red works just like a stop sign: stop fully, then go when it is safe. A flashing yellow does not make you stop; it tells you to slow down and watch out. If the signal is dark or broken, every driver treats the intersection as an all-way stop.
Signs speak through shape. An eight-sided sign always means stop, an upside-down triangle means yield, a five-sided sign marks a school zone, and a diamond warns of a hazard ahead. A round yellow sign tells you a railroad crossing is coming.
Lines on the road tell you about traffic direction. Yellow lines separate traffic going opposite ways, and white lines separate lanes going the same way. A double solid yellow line means no passing, while a broken yellow line on your side means you may pass when it is safe.
Key concepts
Flashing red light
Treat it exactly like a stop sign. Come to a full stop, yield to anyone who has the right of way, and go only when it is safe.
Memory tipRed = stop, whether steady or flashing. Flashing only means you may go after the stop.
Source: California Vehicle Code (VC 21457) / CA DMV Driver Handbook · as of 2026
Flashing yellow light
A warning. You do not have to stop, but you must slow down and pay extra attention before going through.
Memory tipYellow = caution. Think of a flashing yellow as a blinking 'be careful' sign.
Traffic signal not working
When a traffic light is dark or out of order, every driver must stop as if the intersection had a stop sign on every corner, then take turns.
Memory tipDead light = all-way stop. Nobody gets a free pass.
Source: California Vehicle Code (VC 21800) / CA DMV Driver Handbook · as of 2026
Sign shapes
Octagon (8 sides) = stop. Upside-down triangle = yield. Pentagon (5 sides) = school zone or school crossing. Diamond = warning of a hazard. Round = railroad crossing ahead.
Memory tipCount the sides: 8 for STOP, 5 for school (it looks like a little schoolhouse).
Yellow vs. white lines
Yellow lines divide traffic moving in opposite directions. White lines divide lanes moving in the same direction and also mark the right edge of the road.
Memory tipYellow = 'yo, oncoming traffic.' White = 'with me, same way.'
Double solid yellow line
No passing in either direction. You may cross it only to turn left into or out of a driveway or private road, or to make a legal U-turn.
Memory tipTwo solid lines = a wall for passing, but a door for left turns.
Often tested
- Test writers like to swap flashing red and flashing yellow. Only flashing red requires a full stop.
- A broken signal is an all-way stop, not a yield and not 'whoever is fastest.'
- Know the shapes: the pentagon (school) and the round sign (railroad ahead) are the ones people mix up.
- Passing is allowed only where the broken line is on your side of the road.
Easy to confuse: Steady vs. flashing lights
| Light | Steady | Flashing |
|---|---|---|
| Red | Stop and wait until it turns green | Stop fully, then go when safe (like a stop sign) |
| Yellow | The light is about to turn red; stop if you safely can | Slow down and go through with caution |
3 sample questions
Verified practice questions from this unit.
Question 1. You come to an intersection where the traffic light is flashing red. What must you do?
- ① Slow down and go through without stopping
- ② Wait until the light turns green
- ③ Come to a complete stop, then go when it is safe
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Answer: ③ Come to a complete stop, then go when it is safe
Key point: Flashing red light = treat it like a stop sign
A flashing red light works the same as a stop sign. Stop completely, look for cross traffic and pedestrians, and go only when it is safe. The light will not turn green, so waiting for green is pointless.
Wrong answers
- Slow down and go through without stopping: Slowing down without stopping is what you do at a flashing yellow light, not a flashing red one.
- Wait until the light turns green: A flashing red light does not change to green. You go after stopping and checking that the way is clear.
Question 2. The traffic light ahead turns solid yellow as you approach. What does this tell you?
- ① You should speed up to get through before it turns red
- ② The light is about to turn red, so stop if you can do so safely
- ③ You may keep going because yellow means the same as green
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Answer: ② The light is about to turn red, so stop if you can do so safely
Key point: Solid yellow = red is coming; stop if it is safe to stop
A solid yellow light warns that the signal is about to turn red. If you can stop safely, stop. If you are already too close to stop safely, carefully continue through the intersection.
Wrong answers
- You should speed up to get through before it turns red: Speeding up to beat the light is dangerous and is exactly what the yellow light is meant to prevent.
- You may keep going because yellow means the same as green: Yellow is a warning that red is coming. It does not give you the same right to go as a green light.
Question 3. You reach an intersection where the traffic signals are completely dark because of a power outage. What should you do?
- ① Give the right of way only to vehicles on the larger road
- ② Drive through slowly, since there is no signal to obey
- ③ Treat the intersection as a four-way stop
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Answer: ③ Treat the intersection as a four-way stop
Key point: Dark (not working) traffic signal = all-way stop
When a traffic signal is not working at all, California law treats the intersection like an all-way stop. Stop completely, then take turns with the other drivers, yielding as you would at a four-way stop.
Wrong answers
- Drive through slowly, since there is no signal to obey: You still must stop. Rolling through without stopping is how serious crashes happen at dark signals.
- Give the right of way only to vehicles on the larger road: The size of the road does not matter here. Every driver stops, and drivers take turns.