United States Department of Transportation
i
Guidelines for signal operations at intersections with wide medians.
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2010-03-01
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[PDF-632.50 KB]
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Edition:Technical Report; Sept. 2008-Aug. 2009.
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Abstract:The objective of this project is to evaluate the operations at signalized intersections with wide medians in
order to improve safety and efficiency. Intersections with wide medians are characterized by two
intersections and operate differently compared to a typical intersection. Space in the wide median between
the two intersections can be used to store vehicles. However management of the storage space is critical to
avoid queue backing up into the upstream intersection. There are no guidelines specific to operate such
intersections. This results in agencies using their discretion to develop strategies to operate such
intersections, resulting in inconsistent operations. Texas Transportation Institute researchers used VISSIM
simulation model to evaluate numerous strategies that were either in use by TxDOT districts or were
developed by the research team. These strategies were evaluated for various widths of medians, the number
of lanes for the minor street in the median, and the presence of left-turn bays on the major street. The
strategies were also evaluated for low, medium, and high volumes on the major street and on the minor street
as well as different percentages of turning traffic. The research project produced recommended strategies for
various volume and geometric conditions.
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