California traffic signals, explained
Red, yellow, green, and arrows each tell you exactly what to do. Here's every California traffic light and the right response.
California traffic signals control who goes and when. This guide explains every signal you'll meet — solid and flashing red, yellow, and green, plus turn arrows and lane signals — straight from the California Driver Handbook, with exactly what you must do at each. Knowing the rules cold keeps you safe and answers the signal questions on the DMV knowledge test.
Red signals
A solid red light means stop behind the limit line, crosswalk, or intersection. After stopping, you may turn right on red — and left on red from a one-way onto a one-way — unless a sign prohibits it, once it's safe. A red arrow means stop; you may not turn in the arrow's direction until it changes. A flashing red light means the same as a stop sign: stop completely, then go when it's safe.
Yellow signals
A solid yellow light means the signal is about to turn red — stop if you can do so safely; do not speed up to beat the light. A flashing yellow light means slow down and proceed with caution. A flashing yellow arrow means you may turn in that direction but must first yield to oncoming traffic and pedestrians.
Green signals
A solid green light means go — but only if the intersection is clear; you must still yield to pedestrians and vehicles already in it. A green arrow means a protected turn in the arrow's direction: oncoming traffic is stopped, but you still yield to anyone still in the crosswalk or intersection.
Arrows & lane signals
Green arrow = protected turn; red arrow = no turn that way yet; flashing yellow arrow = turn after yielding. Over freeway and toll lanes, a red X means the lane is closed, a green arrow means it's open, and a flashing yellow X means the lane is for turning or is changing use.
Special situations
If a signal is dark (power out) or shows flashing red in all directions, treat the intersection as an all-way stop: stop, then proceed in turn. Always obey a police officer or flagger over a signal. Pedestrian signals show a walk symbol (you may cross), a flashing don't walk or countdown (finish crossing, don't start), and a steady don't walk (do not enter the crosswalk).
Traffic signals on the California DMV test
The California knowledge test asks what each signal means and the correct response — especially right-turn-on-red, yellow-light decisions, and dark or flashing signals. Learn the rules here, then practice with real DMV-style questions until they're automatic.
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Common questions
Can you turn right on a red light in California?
Yes — after coming to a complete stop and yielding to pedestrians and cross traffic, you may turn right on a solid red light unless a sign says “No Turn on Red.” You may also turn left on red from a one-way street onto another one-way street.
What should you do at a flashing red light?
Treat a flashing red light exactly like a stop sign: come to a complete stop, then proceed when it is safe and it is your turn.
What does a yellow traffic light mean?
A solid yellow means the light is about to turn red — stop if you can do so safely. Do not speed up to get through. A flashing yellow means slow down and proceed with caution.
What do you do when a traffic signal is not working?
If a signal is dark or flashing red in all directions, treat the intersection as an all-way (four-way) stop: every driver stops, then proceeds in the order they arrived.