Traffic signal operations handbook.
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2009-03-01
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Alternative Title:Project title: Best TxDOT practices for signal timing and detection design at intersections
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Edition:Product; Sept. 2006-Aug. 2008.
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Abstract:The Texas Department of Transportation (TxDOT) operates thousands of traffic signals along state highways
in the state of Texas, both in rural areas and small cities. The timing and maintenance of these signals are the
responsibility of the TxDOT districts in which they are located. As a result, each district has an interest in
traffic signal timing design, detection design, and traffic signal maintenance. The local operation and
maintenance of traffic signals has served the state well over the years. However, the same local control of
signal operation and maintenance has resulted in differences in practice across the state. As traffic on Texas
highways increases, these differences may lead to operational inconsistencies and sub-optimal performance,
which can increase delays and fuel consumption.
This handbook provides guidelines for timing traffic control signals at intersections that operate in isolation
or as part of a coordinated signal system. The guidelines are intended to describe best practices, as identified
through interviews with TxDOT engineers and technicians, and to identify conditions where alternative
practices are equally workable. The handbook is intended to make resource investment in signal timing
maintenance cost-effective and signal operation more consistent on an area-wide basis. It is likely to be most
useful to engineers that desire quick-response methods for maintaining or improving the operation of existing
signalized intersections.
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