Operational characteristics of the single-point urban interchange /
| Main Author: | |
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | The overall goal of this research was to quantify the operational characteristics of the single-point urban interchange (SPUI) for the purpose of assessing its operational performance. This goal was achieved by both the theoretical modeling of driver behavior at signalized junctions and the direct quantification of minimum discharge headway and lost time at three SPUIs. For this research, models of driver acceleration, speed, headway, start-up lost time, and use of the yellow interval were derived and then calibrated using field data collected at three SPUIs in Florida. At each SPUI, data for a cross road left-turn, a cross road through, and an off-ramp left-turn movement were collected. This research found the minimum discharge headway of the SPUI's left-turn movements to be lower than that of its through movements and lower than values traditionally used for protected left-turn movements under "ideal" conditions. This research also found that the traffic capacity of the SPUI decreases as the size of its signalized conflict area increases. For SPUIs without frontage roads, this trend led to small increases in delay with size; however, the addition of frontage roads and a frontage road phase led to significant increases in delay. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Civil engineering." |
| Physical Description: | xi, 241 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |