Operational flexibility requirements encompass freeway design measures that would enable effective freeway congestion mitigation, including incident management and treatment of bottleneck locations. Freeway congestion mitigation efforts currently being applied are reviewed with respect to how operational flexibility might enable easier and faster implementation. A primary objective of the research was to identify those concepts that would most likely be part of congestion mitigation schemes that are implemented. Therefore, incident management and bottleneck mitigation were selected as two congestion mitigation concepts that are almost certainly to be implemented on virtually all urban freeways. Using video surveillance capabilities at the San Antonio and Houston, Texas, traffic control centers, the researchers examined a large number of freeway incidents. Detailed characterizations of the incidents, emergency responses, and effects upon freeway traffic were prepared. From this analysis a clear need for a pathway for emergency vehicles to reach incident sites was identified. Additionally, a clear need for a haven for disabled or damaged vehicle was identified. A detailed case study of bottleneck sites and recommended solutions, some already implemented, led to development of a series of operational flexibility design concepts.
Freeway Operational Flexibility Concepts
2001
200 pages
Report
Keine Angabe
Englisch
Freeway operational improvements
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