More about flashing yellow arrows.Ģ022 Minnesota Department of Transportationģ95 John Ireland Blvd, St. Traffic signals allow the orderly movement of vehicles and pedestrians through an otherwise challenging intersection. Otherwise, these traffic signals work the same as traditional signals. His signal (pictured right) had two lamps, one red and one green, and was installed in a large wooden box with two six-inch holes on each side. Lester was the head of the traffic division of the Salt Lake City Police Department. When illuminated, the flashing yellow arrow allows waiting motorists to make a left-hand turn after yielding to oncoming traffic. The first electric traffic light was invented by Lester Farnsworth Wire and installed in Salt Lake City in 1912. Please note that UTC is not responsible for temporary traffic.
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