Safety of U-Turns at Unsignalized Median Openings (2004) / Chapter Skim
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Analysis of field data found that, for most types of median openings, most observed traffic conflicts involved major-road through vehicles having to brake for vehicles turning from the median opening onto the major road; however, for median openings at four-leg intersections without left-turn lanes on the major road, most of the observed traffic conflicts involved major-road through vehicles having to brake for vehicles turning left into the median opening. Accident studies of existing median openings were conducted to determine the relative safety performance of median openings of various types.
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From page 2... ...
Based on these limited accident frequencies, there is no indication that U-turns at unsignalized median openings constitute a major safety concern. Because of the low median opening accident frequencies, no satisfactory regression relationships relating median opening accident frequency to the volume of U-turn and left-turn maneuvers through the median opening could be developed.
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