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Effective measures to restrict vehicle turning movements.
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2015-12-01
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[PDF-329.36 KB]
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Abstract:This study evaluated alternatives to raised/non-traversable medians on driveways and approaches.
Raised medians are often considered as an effective technique to limit direct left-turns that may be due
to a significant number of conflict points. The raised medians provide an added benefit of improved
corridor aesthetics. This research effort specifically reviewed a variety of turn restriction alternatives
to determine how effective they may be in addressing the safety and operational needs of the
transportation network while still considering contextual sensitivities. The turn restrictions evaluated
in this report are broadly separated into three categories: turn restrictions located only at the access
point, turn restrictions located only in the roadway (typically some sort of median configuration), and
combined turn restriction configurations. The literature review also identified the jug handle and
roundabout design that could be considered to restrict turning maneuvers, but this research did not
extend to these two infrastructure alternatives. The research team performed field evaluations in
Oregon and Texas to determine the effectiveness of various turn restriction configurations. For the
Oregon locations, the research team also evaluated recent crash histories to determine if turn
restrictions were linked to observed crashes. In addition, the research team performed microsimulation
evaluations to identify the operational impacts of the various turn maneuver restrictions.
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