Dynamic flashing yellow arrow (FYA) : a study on variable left turn mode operational and safety impacts.

Details

• Creators:
  Radwan, Essam ; Abou-Senna, Hatem ; Navarro, Alex ; Chalise, Sandesh
• Corporate Creators:
  University of Central Florida. Center for Advanced Transportation Systems Simulation
• Subject/TRT Terms:
  • Signalized intersections
  • Left turn phase
  • Flashing traffic signals
  • Arrows (Signals)
  • Yellow interval (Traffic signal cycle)
  • Decision support systems
  • Traffic control centers
  • Traffic safety
  • Exclusive permissive phasing
  • Periods of the day
• Publication/ Report Number:
  BDK78 977-15
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation. Research Center
• Abstract:
  Accommodating left turns at signalized intersections has been a challenge for traffic engineers as they ; seek balance between two conflicting goals; capacity and safety. The use of a four-section head for the left-turn ; lane only with a flashing yellow arrow indication for permissive left turns has been deemed to be the new ; standard for signalization. With the advent of this new signal configuration, there was the opportunity to take the ; protected-permitted left-turn mode to a new level of operation. Although numerous studies have developed ; warrants and guidelines for selecting left-turn control types, to date there are no clear or uniform standards for the ; implementation of a variable left-turn mode, changing by time-of-day. Hence, there is a need to develop an ; interactive and efficient framework to serve as a decision support system (DSS) for the evaluation of left-turn ; phasing alternative based on intersection conditions. This framework will allow (1) an interactive evaluation of ; left-turn phasing and ultimately recommend phasing mode by time-of-day and (2) Traffic Management Center ; (TMC) data to be fed into the DSS so that intersections requiring attention/modification of left-turn mode can be ; flagged. The current study develops an interactive DSS for assessing the likely benefits of warranting a permitted ; left-turn phase using custom design approach. The developed DSS is designed to predict these benefits based on ; multilevel factorial parameters that are practical and applicable to assist TMCs in evaluating the efficiency of a ; permitted left-turn phase by time of day.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26888/dot_26888_DS1.pdf
• File Type:
  [PDF - 3.46 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:e05aed3a4e4b475d9d2f402015dccc6dba236d182b446ed5359761ed454ca647