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Lexicon for Conveying Travel Time Reliability Information. The Second Strategic Highway Research Program
| 题名： | Lexicon for Conveying Travel Time Reliability Information. The Second Strategic Highway Research Program |
| 作者： | Kuhn, B.; Higgins, L.; Nelson, A.; Chrysler, S. |
| 关键词： | Travel time##Reliability##Lexicon##Trip time##Conveying##Public transportation##Highways##operations and traffic management##Passenger transportation##Safety and human factors## |
| 摘要： | The second Strategic Highway Research Program (SHRP 2) Reliability Program aims to improve trip time reliability by reducing the frequency and effects of events that cause travel times to fluctuate unpredictably. Congestion caused by unreliable, or nonrecurring,events is roughly as extensive as congestion caused by routine bottlenecks (Cambridge Systematics, Inc. 2003). Nonrecurring events such as crashes, work zones, special events, and weather disrupt normal traffic flow by causing reduced speeds, lane closures, and erratic driving maneuvers. The goals of the SHRP 2 Reliability focus on travel time variation—the characteristic of the transportation system that can cause a driver’s trip to take much longer than normally expected. For example, a driver must allow an hour to make a trip that normally takes 30 minutes. This transportation system characteristic is important for travelers and shippers and is a component of the congestion problem in which transportation agencies can make significant and measurablegains even as travel demand grows. Reducing delays related to reliability has the added benefit of reducing primary and secondary crashes, vehicle emissions, and fuel use, as well as other benefits.Travel time reliability information includes cumulative data about traffic speeds and trip times that take into account historical variations from day to day and enable individuals to understand the level of variation in traffic. Unlike real-time travel time information, which provides a current or recent snapshot of trip conditions and travel time, reliability information can be used to plan and budget in advance for a trip. Three points at which travelers might want to access travel time reliability information include the following: |
| 总页数： | 69 |
| 报告类型： | 科技报告 |
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