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Use of Flashing Yellow Operations to Improve Safety at Signals with
Protected-Permissive Left Turn (PPLT) Operations
Principal Investigator: Dr.
Yi Qi
Sponsoring Agency: Texas
Department of Transportation (TxDOT)
Collaborator:
Dr. Khali Persad (UT /CTR)
Period: September
1, 2009 ~ August 31, 2011
Research Abstract:
Use of flashing yellow operations with protective/permissive
left-turn (PPLT) has been proved by previous studies to be able to
improve safety and efficiency of intersections. Currently, there is
no clear guidance on how to implement flashing yellow operations
with PPLT in Texas. The proposed project is to develop guidelines
for the implementation of the flashing yellow arrow with
protected-permissive left-turn (FYAPPLT) display operations in
Texas. For this purpose, the research will 1) review and synthesize
the state or national practices on the FYAPPLT display, 2) identify
the software and hardware issues with the deployment of the FYAPPLT
display, 3) conduct stage 1 field test at two selected
intersections, 4) identify problems encountered in the stage 1 field
test, 5) deploy the FYAPPLT display at the two original stage 1
field test intersections and three additional selected intersections
(five total intersections) as a stage 2 field test, 6) evaluate the
safety performance of the FYA operations from the deployment of the
FYAPPLT stage 2 field test, 7) develop guidelines for the
implementation of the FYAPPLT display, and 8) provide training
strategies and materials for TxDOT personnel as a workshop.
Research Information
For further information about the research, please contact Dr. YI Qi
by telephone at (713) 313-6809 or by e-mail at
qiy@tsu.edu.
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