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City of Lake Oswego

Flashing Yellow Arrows

Flashing Yellow Arrows

Flashing Yellow Arrow

You may have seen some new types of traffic signals installed throughout the metropolitan area. The Flashing Yellow Arrow (FYA) signals are the new standard for permissive left turn movements. A permissive turn is one that can be made through gaps in oncoming traffic. (Protected turns occur when all conflicting movements are stopped.)

In general, FYAs will increase intersection efficiency and have been found to be a safe alternative to other permissive signal configurations.

Approximately five Lake Oswego signals have been upgraded to incorporate FYA and there are plans to do more. Not all intersections are good candidates, however. Our staff regularly monitors intersection safety and efficiency.

Here’s what to know (from ODOT’s website):

Red singal image

A solid red arrow means STOP. Drivers turning left must stop.*


Solid yellow signal image

A solid yellow arrow means stop if it is safe to do so.


Flashing yellow signal image

A flashing yellow arrow means turns are permitted, but you must first yield to oncoming traffic and pedestrians and then proceed with caution.


Solid green signal image

A solid green arrow means turn left. Oncoming traffic must stop. Do not go straight.


*Except where allowed by law. See page 24 in the Oregon's Driver's Manual for more information.

Just remember: flashing yellow = turn with caution.

  • Click on the instructional video link to to watch Washington County, Oregon Traffic Engineering explain proper driving technique when coming upon a flashing Yellow Arrow.
  • Click on the  link to see how the signals work