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- W594072172 abstract "Alternative intersections have unique geometries that theoretically lead to improvements in safety and arterial throughput. Compared to the modern roundabout, widespread adoption of these designs has been slow, due in part to the lack of delay-based analysis methodologies for use in preliminary engineering. Comparative analysis of these geometries previously required microsimulation of each alternative, until FHWA provided a capacity-based spreadsheet tool in 2011, the Capacity Analysis for the Planning of Junctions (CAP-X) program. While the CAP-X tool provides a low-cost and easy to use software for the preliminary engineering stages of a project, the comparative results of this tool have yet to be shown to scale up to delay-based comparative analysis. If the tool indicates that designs x, y, and z perform best from a capacity perspective, there is no guarantee that x, y, and z will correspondingly perform best from a delay perspective. This paper seeks to determine whether the results from CAP-X are applicable. Results at this time are limited to a sensitivity analysis of volume combinations, examining the impact of total volume magnitude while holding the percentage of left-turning vehicles and major/minor approach splits constant. Preliminary results indicate that the CAP-X tool has significant limitations as a tool for choosing alternatives. Future research is recommended to investigate the potential for using capacity-to-delay transformation equations that are specific to each alternative, integrating these equations into CAP-X to ensure its future usefulness in the analysis of alternative intersection designs." @default.
- W594072172 created "2016-06-24" @default.
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- W594072172 date "2015-01-01" @default.
- W594072172 modified "2023-09-26" @default.
- W594072172 title "Capacity-based Predictions and Delay-based Results: CAP-X Limitations and Suggestions for Improvement" @default.
- W594072172 hasPublicationYear "2015" @default.
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