United States Department of Transportation
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Development of guidelines for operationally effective raised medians and the use of alternative movements on urban roadways.
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2012-10-01
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[PDF-13.44 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-PLANNING AND POLICY-Access Management;
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Abstract:The development of raised medians is an important access management technique commonly used in urban settings. It
can be used to control or restrict mid-block left turns, U-turns or crossing maneuvers for implementing of alternative
left-turn/U-turn movements. The objective of this research project was to develop guidelines for operationally effective
raised medians and the use of alternative movements on urban roadways. To fulfill this goal, the researchers (1)
reviewed and synthesized national and peer states’ practices, (2) conducted survey of traffic engineers, (3) conducted
field studies, (4) analyzed the design issues relating to raised medians and alternative movements through simulation
studies, and (5) developed guidelines for future implementation of raised medians and representative alternative
movements in Texas.
The results of this study provide recommendations on some critical design issues in the use of raised medians,
including median widths, median left-turn lane lengths, placement of median openings, and the use of directional
median openings. In addition, a set of implementation-oriented guidelines regarding the applicability, geometric
design, and access management of three typical types of alternative movements, including restricted crossing U-turn
(RCUT), median U-turn (MUT) and continuous flow intersection (CFI), were developed.
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