Traffic control strategies for congested freeways and work zones.
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2008-10-01
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Alternative Title:Project title: Improved techniques for traffic control for freeways and work zones
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Edition:Technical report; Sept. 2005-Aug. 2007.
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Abstract:The primary objective of the research was to identify and evaluate effective ways of improving traffic operations and
safety on congested freeways. There was particular interest in finding condition-responsive traffic control solutions
for the following problem areas: (1) end-of-queue warning, (2) work zones with lane closure, and (3) queue spillover
at exit ramps. Available techniques considered by this research include combination of static and dynamic queue
warning systems, dynamic merge control in advance of freeway lane closures, and various traffic control strategies,
such as traffic diversion and ramp metering, to mitigate queue spillover at exit ramps.
Three sets of evaluation studies were conducted: first, two queue warning systems deployed on IH 610 and US 59 in
Houston, Texas, were evaluated based on field observations. Second, strategies to resolve a ramp spillover problem at
an exit ramp in El Paso, Texas, were analyzed using traffic simulations. Third, the Dynamic Merge work zone traffic
control concept was evaluated using traffic simulations, and recommendations were developed for its potential use for
various work zone types with different lane closure configurations.
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