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Flashing Yellow Arrow Deployment

In the ongoing effort to improve safety and mitigate congestion and delay along Douglas County roadways, Traffic Engineering has implemented the Flashing Yellow Arrow (FYA) at various intersections within Douglas County.

The intent of the FYA display is to visually stimulate drivers to take extra caution when completing a permissive left-turn across approaching traffic.  In addition to emphasizing caution, the FYA also provides operational  benefits over traditional permissive left-turn displays. One of these benefits includes the ability to address timeframes where higher than expected approach turn (left-turn vs approaching vehicle) accidents occur.  The FYA enables “protected by time of day” (red arrow) left-turn operations to address temporal accident patterns while also providing the ability to provide permissive left-turn operations during low volume (early morning and/or late night) time periods. During protected by time of day operations (red arrow), the flashing yellow arrow display is turned off.

Traffic Engineering staff conducted a review of all signalized intersections in unincorporated Douglas County to ascertain the viability of implementing FYA.  Not every intersection is a good FYA candidate for a variety of reasons, like safety and cost.

The following intersections have been chosen for initial deployment of FYA:

  • McArthur Ranch Rd & Valleybrook/Wagon Box Cir (east/westbound approaches)
  • County Line Rd & Shoppes (7100 East) (east/westbound approaches)
  • Lucent Blvd & Town Center Drive (south/north/westbound approaches)
  • Highlands Ranch Pkwy & Wildcat Reserve Pkwy (east/westbound approaches)
  • Broadway St & Wildcat Reserve Parkway (east/westbound approaches)

Staff will monitor the performance of these intersections and will continue to identify other possible locations where the FYA could be a benefit to safety and operations.

The graphic below explains how to treat a FYA when encountered at an intersection. Please keep an eye out as they are deployed to a Douglas County intersection near you!