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The Research Team has completed the tasks identified in the research approach. The final report prepared by the Research Team is currently scheduled for publication by NCHRP during the summer of 2003.

Currently the Research Team is working with the National Committee on Uniform Traffic Control Devices (NCUTCD) to discuss the findings of the NCHRP 3-54 research effort and to examine the potential incorporation of the flashing yellow arrow in the Manual on Uniform Traffic Control Devices as an alternate to the permissive circular green indication.

Driver Simulation Study Status

Using full-scale dynamic driving simulators located at the University of Massachusetts (UMass) and the Texas Transportation Institute (TTI), the Research Team developed a virtual driving environment to further test driver understanding of select PPLT displays and associated behavior. Study participants were required to navigate a virtual world containing various signal displays, different arrangements and locations, and opposing traffic, with the intent of evaluating driver performance at pre-selected intersections controlled by PPLT displays in an actual driving environment. The researchers at UMass and TTI were tasked with each testing 200 drivers of various demographic backgrounds.

The Research Team has completed the driver simulation confirmation studies. Working Paper 7, which summarizes the confirmation study findings, is now available for downloading in the documents section.

FLASHING YELLOW ARROW IMPLEMENTATION STATUS UPDATE!

Although the Research Project is nearly completed, the Research Team continues to support the implementation of the experimental flashing yellow arrow display at key study locations across the county.

Field implementation of an experimental flashing yellow arrow display was conducted to field test a display that had shown promise in safety and driver comprehension in previous task activities and had ranked high in the Engineering Assessment. Volunteer agencies were sought from across the United States to install and operate the experimental flashing yellow arrow display. In conjunction with use of the experimental display (which required permission from the Federal Highway Administration (FHWA) to operate), “before” and “after” studies were completed at each intersection where the flashing yellow arrow display was installed and at nearby control sites. These “before” and “after” studies allowed the Research Team to quantify the impact of the changeover from the MUCTD circular green indication to the flashing yellow arrow indication.

Working Paper 8, which summarizes the implementation study findings, is now available for downloading in the documents section. Photos from Broward County, Florida and Beaverton, Oregon and their implementation of the experimental flashing displays are summarized on the next page.


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