Median Cross-Section Design for Rural Divided Highways (2014) / Chapter Skim
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1 S u m m a r y The AASHTO Policy on Geometric Design of Highways and Streets, commonly known as the Green Book, contains general median width and median side slope design guidance that has remained unchanged for many years. Crashes where a vehicle crosses the median and continues into the opposing lanes are often very severe.
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2Median Slope The crash analysis indicates that the median slope ratio also has opposing effects for CMC and rollover crashes, but that these opposing effects for median slopes are opposite to the effects for median width. Crash prediction models for rural four-lane freeways show that flatter slopes are associated with more CMCs and fewer rollover crashes.
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