United States Department of Transportation
i
Dynamic flashing yellow arrow (FYA) : a study on variable left turn model operational and safety impacts, [technical summary].
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2013-12-01
[PDF-926.27 KB]
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Abstract:Traffic engineers use various left-turn signalization
methods to find an optimal balance of safety and
efficiency. While protected/permitted left-turn
configurations allow most left-turning traffic to
turn during the protected phase, the permitted
phase exploits the efficiency of using available
gaps in oncoming traffic to facilitate additional
left turns. In many cases, concerns arise with left
turning traffic patterns during certain times of
day, such as school arrival and dismissal. When
such concerns arise, engineers have changed from
protected/permitted phasing to protected-only
by changing the signal displays. Historically, this
change required physical replacement of overhead
signal displays and was essentially a permanent
change, even though it may only be needed a few
hours per day. The four-section display with a
flashing yellow arrow overcomes this limitation.
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