Learn about the Flashing
As part of the NCHRP 3-54 Research project, a flashing
yellow arrow was investigated for use in protected/permissive left-turn
control. The graphic below illustrates how the flashing yellow arrow
And here's what the indications
Solid Red Arrow = Stop. No left
Solid Yellow Arrow = Prepare to stop.
Flashing Yellow Arrow = Left turns allowed, but
first yield to oncoming traffic and pedestrians.
Solid Green Arrow = Left turns allowed. Proceed with
This section of the web site provides more information
about how the flashing yellow arrow addresses existing issues such as the
“yellow trap” as well as information about how it was tested and put to
use in real world implementation studies.
How it works
[Back] to Status
of Research Study Findings