Evaluation of Variable Speed Limits in Work Zones PDF Download
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Author: Disapat Lavansiri
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 312
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Author: Disapat Lavansiri
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 312
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Book Description
Author: Virginia P. Sisiopiku
Publisher:
ISBN:
Category : Traffic congestion
Languages : en
Pages : 222
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Author: Yali Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 272
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Book Description
Author: Nicholas J. Mazzenga
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 42
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Book Description
Persistent daily congestion, which has been increasing in recent years, is commonly experienced for several hours or more during the morning and evening on Virginia's urban freeways. Many of these roadways are at or near capacity, which causes severe delays and backups. One solution to reducing recurring congestion is to add capacity by building more lanes; however, this is usually the last resort as it is an expensive and time-consuming approach. Another strategy proposed to combat recurring congestion is to manage the current freeways so that they operate more efficiently. Reducing congestion through better managed freeways has numerous documented benefits, including reducing travel times, smoothing the traffic flow, increasing average fuel economy, shortening the rush hour period and reducing vehicle queuing. The highway operational strategies implemented to reduce recurring congestion have shown promising results abroad where there is an extensive use of active traffic management systems. To prove the effectiveness of a better managed freeway in mitigating recurring congestion, this study tested the effectiveness of an active traffic management system on a simulated model of I-66 and I-95 in Northern Virginia. Hard shoulders, variable speed limits, and ramp metering are several active traffic management systems simulated in this study. The simulation model was based on the geometric characteristics, ramp volumes, vehicle flows, and speeds of actual recorded conditions. Compared with the simulated control conditions, the results of the study indicated improvements in average fuel economy, travel delay, delay of the onset of congestion, and reduction of queues. The two active traffic management systems, i.e., variable speed limits and hard shoulders, showed the highest potential for reducing recurring congestion and should be considered as potential countermeasures in congested corridors. Although the capital costs of implementing these strategies would be high, the return on investment in the first year of operations is estimated at $500,000, with the potential to grow to as much as $8 million annually in subsequent years.
Author: Yong Bai
Publisher:
ISBN:
Category : Crash injuries
Languages : en
Pages : 172
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Book Description
The primary objective of this research was to investigate the characteristics of fatal crashes and risk factors to these crashes in the work zones so that effective countermeasures could be developed and implemented in the near future. The objective was accomplished using a four-step approach.
Author: Jaume Barceló
Publisher: Springer Science & Business Media
ISBN: 1441961429
Category : Business & Economics
Languages : en
Pages : 450
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Book Description
The increasing power of computer technologies, the evolution of software en- neering and the advent of the intelligent transport systems has prompted traf c simulation to become one of the most used approaches for traf c analysis in s- port of the design and evaluation of traf c systems. The ability of traf c simulation to emulate the time variability of traf c phenomena makes it a unique tool for capturing the complexity of traf c systems. In recent years, traf c simulation – and namely microscopic traf c simulation – has moved from the academic to the professional world. A wide variety of traf- c simulation software is currently available on the market and it is utilized by thousands of users, consultants, researchers and public agencies. Microscopic traf c simulation based on the emulation of traf c ows from the dynamics of individual vehicles is becoming one the most attractive approaches. However, traf c simulation still lacks a uni ed treatment. Dozens of papers on theory and applications are published in scienti c journals every year. A search of simulation-related papers and workshops through the proceedings of the last annual TRB meetings would support this assertion, as would a review of the minutes from speci cally dedicated meetings such as the International Symposiums on Traf c Simulation (Yokohama, 2002; Lausanne, 2006; Brisbane, 2008) or the International Workshops on Traf c Modeling and Simulation (Tucson, 2001; Barcelona, 2003; Sedona, 2005; Graz 2008). Yet, the only comprehensive treatment of the subject to be found so far is in the user’s manuals of various software products.
Author: National Research Council (U.S.). Transportation Research Board
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 224
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Author: Xiao-Yun Lu
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 278
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Book Description
Author: European Conference of Ministers of Transport
Publisher: OECD Publishing
ISBN:
Category :
Languages : en
Pages : 296
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Book Description
This Report addresses the key issues surrounding traffic speed management and highlights the improvements in policy and operations needed to reduce the extent of speeding.
Author: András Hegyi
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 236
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Book Description
