Median Intersection Design for Rural High-Speed Divided Highways (2010) / Chapter Skim
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Pages 4-15
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4Background A rural expressway is a high-speed (≥50 mph) , multilane, divided highway with partial access control.
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5Figure 1. Typical rural expressway at-grade intersection.
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6Sorted by Percent Change from 1995–2005 Sorted by 2005 Total Miles Sorted by Miles Change from 1995–2005 % CHANGE RANK STATE *
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When this program is complete, the Nebraska Expressway System will be approximately 600 miles in length (7)
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8best circumstances, if the conditions that result in the most problematic intersections are known during the corridor planning stage of an expressway's development, those conditions can be prevented by highway planners and designers. For existing facilities, locations with problematic conditions can be identified and traffic safety engineers can proactively program the appropriate improvements.
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Maze et al.
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of 30 intersections with the highest crash severity index rates in order to examine the impact of hourly peaking on safety performance. After determining the peak hours for each intersection, they found that the 30 highest-severity intersections experienced extreme hourly peaking with 52% of the crashes occurring during the peak hours.
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11 Figure 5. Intersection crash rates and severity by minor road entering volume (2)
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side) set of expressway lanes, but collide with expressway traffic in the second (far-side)
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drivers attempting to select gaps at both the near and far-side intersections. From all of these observations, it appears that the primary safety issue at TWSC rural expressway intersections is rightangle collisions (far-side right-angle crashes in particular)
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confidence, that a safety problem exists and then the design, construction, and/or implementation of a solution may take many years, during which the problem may continue or worsen. For example, the environmental work, preliminary and final design, ROW acquisition, and construction of a rural interchange may be a 5 year project or longer.
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tation of the next intersection improvement. Once more is known about the safety benefits of the various expressway intersection strategies and the impact of volume levels, a more proactive and systematic approach to expressway intersection safety planning can be developed.
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