California Driver Handbook
Roadway Standards
The flashing yellow left-turn signal is in both the State of California and Federal Highway Administration’s Manual on Uniform Traffic Control Devices (MUTCD), the standard for signs, signals, and pavement markings in the United States.
road sign for flashing yellow signals
City of Santa Rosa > Departments > Public Works > Traffic Engineering > Flashing Yellow Left Turn Signals

In 2013, the City of Santa Rosa installed the first flashing yellow left-turn arrow signal in Sonoma County, at the intersection of W. Ninth Street and Dutton Avenue.  This intersection has been the site of numerous left turn accidents where motorists attempting left turns collided with oncoming vehicles. A signal equipped with a flashing yellow left-turn arrow has been shown to reduce these types of collisions.

This new signal configuration has been implemented successfully in other states and is beginning to be utilized in California. A study conducted by the National Cooperative Highway Research Program found that drivers made fewer mistakes with flashing yellow left-turn arrows than with traditional yield-on-green signal configurations.

How to use a flashing yellow left-turn arrow

It’s simple, just remember that a flashing yellow left-turn arrow means turn with caution, after yielding to oncoming cars, bicycles and pedestrians.

Before entering the intersection, look left and look straight ahead.  Is there any oncoming traffic? Are there any on-coming pedestrians or bicyclists?  Oncoming cars, bicycles and pedestrians will have the right-of-way. Once you determine it is safe to do so, make your left turn.  After the flashing yellow left-turn arrow you will see the better-known solid yellow left-turn arrow.  The solid yellow left-turn arrow means what it has always meant: that the signal is about to turn red and you should prepare to stop.

 red left-turn arrow A solid red arrow means STOP. Drivers turning left must stop.
 yellow left-turn arrow The solid yellow arrow indicates the signal will be changing to red and drivers should prepare to stop.
 flashing yellow left-turn arrow A flashing yellow arrow means turns are permitted, but you must first yield to oncoming cars, bicycles and pedestrians and then proceed with caution.
 green left-turn arrow A solid green arrow means turn left. Oncoming traffic must stop. Do not go straight.

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7:30 AM - 5:30 PM

NOTE: our offices are closed every other Friday. View the City Calendar to confirm we are open.

TEL: 707-543-3814
FAX: 707-543-3801

Municipal Services Center
69 Stony Circle
Santa Rosa, CA 95404

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Contact us
If you have questions or comments about the flashing yellow left-turn signal, please contact Massoud Saberian, Supervising Engineer at 707-543-3818 or email at msaberian@srcity.org

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