详情

原文传递 Quantifying Travel Time Variability in Transportation Networks.

题名：	Quantifying Travel Time Variability in Transportation Networks.
作者：	S. D. Boyles; A. Voruganti; S. T. Waller;
关键词：	transportation networks,travel time;traffic allocation, quantification, variability, travel demand, traffic flow, tables (data), figures, transportation planning, regression models, traffic delay;supply-side analysis, demand-side analysis, travel speed di
摘要：	Nonrecurring congestion creates significant delay on freeways in urban areas, lending importance to the study of facility reliability. In locations where traffic detectors record and archive data, approximate probability distributions for travel speed or other quantities of interest can be determined from historical data; however, the coverage of detectors is not always complete, and many regions have not deployed such infrastructure. This report describes procedures for estimating such distributions in the absence of this data, considering both supply-side factors (reductions in capacity due to events such as incidents or poor weather) and demand-side factors (such as daily variation in travel activity). Two demonstrations are provided: using data from the Dallas metropolitan area, probability distributions fitting observed speed data are identified, and regression models developed for estimating their parameters. Using data from the Seattle metropolitan area, the appropriate capacity reduction applied to planning delay functions in the case of an incident is identified. / Supplementary Notes: Sponsored by Southwest Region Univ. Transportation Center, College Station, TX. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A04/MF A04 / NTIS In-house Control Codes: utatti;12111,1101
报告类型：	科技报告