Traffic Lights & Pedestrian Signals in California
Traffic signals control the flow of vehicles and pedestrians at intersections. California law is specific about what you must do at each signal — and getting it wrong is one of the most common causes of intersection collisions.
Standard Traffic Light Rules
A steady green light means you may proceed if the intersection is clear — you must still yield to vehicles and pedestrians already in the intersection. A steady yellow light means the signal is about to turn red; you should stop if you can do so safely. Do not speed up to beat a yellow light. A steady red light requires a complete stop. You may turn right on a red after stopping, unless a sign prohibits it.
Flashing Signals
A flashing red light must be treated exactly like a stop sign — come to a complete stop, then proceed when safe. A flashing yellow light is a warning to slow down and proceed with caution. If traffic signals are completely dark (power outage), treat the intersection as a four-way stop.
Pedestrian Signals
A WALK signal or walking person symbol means pedestrians may cross. A flashing or steady DON'T WALK (or raised hand) means pedestrians should not begin crossing. If you're already in the crosswalk when it starts flashing, proceed safely to the other side — don't stop in the middle. Drivers must always yield to pedestrians in crosswalks.
Key Rules at a Glance
- Flashing red light: Treat as a stop sign
- Flashing yellow light: Slow down, proceed with caution
- Dark/unlit signal: Treat as a four-way stop
- Right turn on red: Allowed after full stop unless posted otherwise
- Yellow light: Stop if you can do so safely