United States Department of Transportation
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Exploring corridor operations in the vicinity of a diverging diamond interchange (DDI) : final report.
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2016-06-27
[PDF-14.87 MB]
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Edition:Final report, August 2013 to May 2016
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Abstract:This research effort examined the corridor impacts of various signal timing and geometric strategies to improve the
operational challenges observed at DDIs. A microsimulation analysis was conducted using a calibrated and validated DDI
modeled after the National Avenue and US-60 interchange in Springfield, Missouri. Four heavy volume scenarios were
tested in combination with seven categories of strategies. These strategies were selected from a larger pool of strategies
under the guidance of the NCDOT research panel and national expert recommendations. In addition to the microsimulation
effort, a cost analysis was conducted for the same strategies. Considerations were made for implementation cost, disruption
to user during implementation, and crash modification impacts. Finally, three sites in North Carolina were selected for field
study. In the microsimulation analysis, those strategies which reduced the number of phases at the downstream adjacent
intersection had the greatest benefit on the corridor routes for all four heavy volume scenarios. The reduction in phases
reduced loss time and increased capacity for the intersection. Unfortunately, these strategies were also the most expensive
alternatives studied, were likely to be the most disruptive to users during implementation.
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