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Flashing Yellow Arrow_pic

Flashing yellow arrow traffic signals feature a flashing yellow arrow in addition to the standard red, yellow and green arrows. When illuminated, the flashing yellow arrow allows waiting motorists to make a left-hand turn after yielding to oncoming traffic. Otherwise, the new traffic signals work the same as traditional signals.

The flashing yellow arrow replaces the circular green signal used in the traditional left-turn signal configuration to indicate the need for left-turning vehicles to yield to oncoming traffic and pedestrians.

Source: Nebraska Department of Roads website

Video Resources:
MoDOT- http://youtu.be/H6-hcgWt7co
MDOT- http://www.youtube.com/watch?v=uIkanxT72KI
Wisconsin DOT - Flashing Yellow Arrow Demonstration