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New Traffic Signal Lights
FLASHING YELLOW ARROW LEFT TURN SIGNAL
Broken Arrow is in the process of adding the next generation of traffic signals that allow protected and permissive left turns from dedicated left turn lanes.

This new configuration will be utilized with the new signals being added at:
  • Tucson Street & Aspen Avenue
  • Tucson Street & Redbud Avenue

See map.

HOW IT WORKS
The new left turn traffic signal head includes the standard Red, Yellow and Green arrows which have been used for years, along with an additional “flashing yellow arrow”.

 If the signal is a...  
 Red Arrow  Stop.  Left turn is not permitted.
 Green Arrow  Safe to turn left.  Oncoming traffic must stop.
 Flashing Yellow Arrow  Left turn is permitted, but driver must yield to oncoming traffic or pedestrians. 
 Steady Yellow Arrow  Driver must prepare to stop as arrow is about to turn red.

Watch the video below to see how it works.




SAFETY
The National Cooperative Highway Research Program (NCHRP) studied the flashing yellow arrow configuration and compared it to various protective/permissive left turn (PPLT) control devices and signal arrangements. The study determined that a flashing yellow arrow PPLT display was consistently found to be equal to or superior to existing PPLT displays, both in a laboratory environment and field experiments in cities. This configuration is now adopted in the Manual on Uniform Traffic Control Devices (MUTCD).

The new standard for protected left turn signals was included in the 2009 edition of the MUTCD, which the state adopted in 2012. The flashing yellow arrow gives left turning traffic more opportunities to pass through an intersection than its predecessor, which was the solid steady green “ball” signal.

PUBLIC AWARENESS AND EVALUATION
The new signal will be the first of its kind here in Broken Arrow. The City will monitor traffic flow at the new signal locations to evaluate if its use would be beneficial throughout the City and for future road/intersection improvements.