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DEVELOPMENT OF GUIDELINES FOR TRIPLE LEFT AND DUAL RIGHT-TURN LANES
Principal Investigator: Dr.
Scott Cooner (TTI) and Dr. Yi Qi (Lead at TSU)
Sponsoring Agency: Texas
Department of Transportation (TxDOT)
Collaborator:
Texas Transportation Institute (TTI)
Period: September
1, 2008 ~ August 31, 2010
Research Abstract:
Triple left turn lanes and dual right-turn lanes are still
considered as relatively new design alternatives that have
been implemented in a very limited number of intersections
in Texas. This project is intended to achieve two goals: (1)
develop geometric design and installation guidelines for
triple left-turn and dual right-turn lanes, and (2) evaluate
the safety and operational performances of existing triple
left-turn and dual right-turn lane sites in Texas. To this
end, the research will (1) review existing design guidelines
and practices regarding triple left-turn lanes and dual
right-turn lanes around the country, (2) perform studies of
existing triple left-turn and dual right-turn locations to
document existing design issues and concerns, operational
performance, and safety performance, (3) identify the
important factors that affect the design, operation and
safety of triple left-turn and dual right-turns, (4) develop
geometric design criteria for triple left-turn and dual
right-turn lanes, (5) develop installation criteria for
determining when triple left-turn or dual right-turn lanes
should be installed, and (6) develop guidance on the signal
design for installation of triple left-turn or dual
right-turn lanes.
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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