Evaluation Of Construction Work Zone Operational Issues

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Evaluation Of Construction Work Zone Operational Issues

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Author :
language : en
Publisher:
Release Date : 2003

Evaluation Of Construction Work Zone Operational Issues written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Highway capacity categories.

Work Zone Operations

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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2000

Work Zone Operations written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Evaluating And Enhancing The Safety Of Nighttime Construction Projects

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Author : Dulcy M. Abraham
language : en
Publisher: Purdue University Press
Release Date : 2007-06-01

Evaluating And Enhancing The Safety Of Nighttime Construction Projects written by Dulcy M. Abraham and has been published by Purdue University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-01 with Transportation categories.

The increased demand on the current highway system has caused transportation agencies to increase scheduling for nighttime work in order to alleviate daytime work zone congestion, especially during peak traffic hours. Although traffic congestion is reduced, safety in nighttime workzones remains a concern among both transportation agencies and contractors. According to the Federal Highway Administration (FHWA), approximately one-half of the fatalities that occurred in workzones nationwide occurred at night. These work zone statistics have received increased attention among agencies to evaluate planning and safety issues concerning the workers and the general public on nighttime workzones. Four separate, but interrelated research studies were conducted between September 2005 - May 2007 to address safety issues in nighttime construction and maintenance projects on highways in Indiana. The first study investigated owner and contractor safety management planning for nighttime construction and maintenance operations, while the second study investigated traffic control planning and implementation procedures for nighttime construction and maintenance operations. The third study investigated the effectiveness of speed control measures on nighttime construction and maintenance projects and the fourth study evaluated the effectiveness of high-visibility personal protective equipment practices.

Work Zone Impacts Assessment

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Author :
language : en
Publisher:
Release Date : 2006

Work Zone Impacts Assessment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Road work zones categories.

Design Of Construction Work Zones On High Speed Highways

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Author : Kevin M. Mahoney
language : en
Publisher: Transportation Research Board
Release Date : 2007

Design Of Construction Work Zones On High Speed Highways written by Kevin M. Mahoney and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Road construction workers categories.

Full Road Closure For Work Zone Operations

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Author : United States. Federal Highway Administration
language : en
Publisher:
Release Date : 2003

Full Road Closure For Work Zone Operations written by United States. Federal Highway Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Road closures categories.

Mobility And Safety Evaluation Of Integrated Dynamic Merge And Speed Control Strategies In Work Zones

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Author : Syed Muhammad Zaier Abbas Zaidi
language : en
Publisher:
Release Date : 2010

Mobility And Safety Evaluation Of Integrated Dynamic Merge And Speed Control Strategies In Work Zones written by Syed Muhammad Zaier Abbas Zaidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Intelligent transportation systems categories.

In recent years, there has been a considerable increase in the amount of construction work on the U.S. national highways. Most of the work undertaken is the reconstruction and rehabilitation of the existing transportation networks. Work zones in the United States are likely to increase in number, duration and length due to emphasis on repair and highway reconstruction as a significant portion of all federal-aid highway funds are now geared toward highway rehabilitation. The challenge of mobility is particularly acute in work zone areas as road repair and construction intensifies traffic issues and concentrates them in specific locations and at specific times. Due to the capacity drop, which is the result of lane closure in work zone area, congestion will occur with a high traffic demand. The congestion increases number and severity of traffic conflicts which raise the potential for accidents; furthermore traffic operational properties of roadway in work zone area become worse. Intelligent Transportation System (ITS) technologies have been developed and are being deployed to improve the safety and mobility of traffic in and around work zones. In several states in the US, the use of Dynamic Merge Controls also known as Dynamic Lane Merge (DLM) system has been initiated to enhance traffic safety and to improve traffic flow in work zone areas. The DLM usually takes two forms; dynamic early merge and dynamic late merge. The use of variable speed limit (VSL) systems at work zones is also one of those measures. VSL systems improve safety by helping the driver in determining the maximum speed that drivers should travel. Besides adding improvement to safety, they are also expected to improve mobility at the work zones. The main goal of this study is to evaluate the safety and operational effectiveness of the dynamic merge systems i.e. the dynamic early lane merge and dynamic late lane merge, in the presence of VSL system. More specifically, the VISSIM model is utilized to simulate a two-to-one lane configuration when one out of the two lanes in the work zone is closed for traffic. Six different scenarios were adopted to assess the effectiveness of these scenarios under different traffic demand volumes and different drivers' compliance rates to the messages displayed by the systems. These scenarios are; [bullet] Work Zone without VSL and without SDLMS or the current Motorist Awareness System (MAS) [bullet] Work Zone with VSL and without SDLMS [bullet] Work Zone with VSL and Early SDLMS [bullet] Work Zone with VSL and Late SDLMS [bullet] Work Zone with early SDLMS and without VSL [bullet] Work Zone with early SDLMS and without VSL An already calibrated and validated VISSIM model for Simplified Dynamic Lane Merge System (SDLMS) in accordance with the real life work zone was modified with a VSL through Vehicle Actuated Programming (VAP) code. Three different logics were coded each for VSL alone, early SDLMS+VSL and late SDLMS+VSL. All these logics were fine tuned with several test runs before finalizing it for the final simulation. It is found through the simulation of above mentioned scenarios that for low and medium volume levels (V0500, V1000 and V1500), there is no significant difference between the Maintenance of Traffic (MOT) plans for mean throughputs. However, for higher volume levels (V2000 and V2500), late SDLMS with and without VSL produced higher mean throughputs for all compliance rates and truck percentages except when the demand volume was 2,500 vph and compliance of 60%, where it produces the significantly lower mean throughputs. In terms of travel time through the work zone, results indicated that there is no significant difference between MOT types for demand levels of V0500 and V1000 when compliance is 40% or less but for compliance of 60% and more, only demand volume level that is not significantly different from other MOT types is V0500. This study revealed that VSL increases travel time through the work zone. This might be due to non-compliant vehicles that follow the compliant vehicle ahead unless they find a sufficient gap in adjacent lane to pass the compliant vehicle. It is also found out that VSL makes the system safer at higher volumes (2,000 vph and 2,500 vph). This was observed through safety surrogate measures selected for this study. Another outcome of this study is that the addition of VSL to the dynamic merge systems helps in improving the overall safety of the system by lowering speed variances and deceleration means of the vehicles travelling through the work zone. The passage of traffic through the work zone is made safer when a speed control is integrated to a dynamic merge system. It can be inferred from the simulation results that integrated SDLMS and VSL systems have better performance in terms of traffic mobility and safety than existing individual controls and also show that the integrated SDLMS and VSL system has more potential than each individual systems.

Guidance For Implementation Of The Aashto Strategic Highway Safety Plan

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Author : Nicholas D. Antonucci
language : en
Publisher: Transportation Research Board
Release Date : 2005

Guidance For Implementation Of The Aashto Strategic Highway Safety Plan written by Nicholas D. Antonucci and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Technology & Engineering categories.

Integrating Planning And Operations Models To Predict Work Zone Traffic

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Author : Ayman Smadi
language : en
Publisher:
Release Date : 2008

Integrating Planning And Operations Models To Predict Work Zone Traffic written by Ayman Smadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Highway capacity categories.

The impetus of this research is to meet the growing need for accurate and practical methods to support traffic analysis in work zones. This research examines the application of two classes of traffic analysis models, macroscopic sketch analysis and microscopic traffic simulation, to work zones. The research will evaluate the application of these tools to an urban interstate work zone. Specifically, this research will examine the following: 1) how the use of traffic analysis models relates to federal requirements about considering traffic impacts of major construction projects, 2) the accuracy of model results in comparison to real-world conditions, and 3) modeling effort and data requirements of these models. The primary objectives of this research are as follows: 1) determining the feasibility of applying a traffic analysis model to a work zone environment, 2) calibrating and validating the simulation models based on data collected in the work zone, 3) using the calibrated model to apply various work zone management strategies, and 4) documenting the research findings and lessons learned from the model applications.

Federal Register

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Author :
language : en
Publisher:
Release Date : 2014

Federal Register written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Delegated legislation categories.