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Operation of Traffic Signal Systems in Oversaturated Conditions. Volume 2. Final Report
| 题名： | Operation of Traffic Signal Systems in Oversaturated Conditions. Volume 2. Final Report |
| 作者： | Gettman, D.; Madrigal, G.; Allen, S.; Boyer, T.; Walker, S. |
| 关键词： | Traffic signals##Intersections##Oversaturated areas##Traffic control##Diagnosis##Infrastructure##Traffic engineering##Signal timing##Sequencing##Scheduling##Traffic controllers##Signal control## |
| 摘要： | This research project included work in several areas related to the operation of traffic signal systems in oversaturated traffic conditions. Quantitative measures were developed that characterize the intensity of oversaturated conditions and can be calculated based on high-resolution data from advance detectors and second-by-second phase timing data. The technique measures the length of the overflow queue at the beginning of the red light and estimates the amount of green time that is wasted either by dispersing this overflow queue or by vehicles that cannot proceed due to a downstream blockage. A heuristic procedure was developed to process the measurements of oversaturation and compute green time modifications on an oversaturated route. A methodology was developed to design timing plans that can improve system throughput and manage queues in oversaturated conditions. The methodology considers three regimes of operation of an oversaturated scenario: (1) loading, (2) processing, and (3) recovery. Individual timing plans are designed for each regime and the switching time between the plans is also determined by the methodology. |
| 总页数： | 364 |
| 报告类型： | 科技报告 |
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