NCHRP Report最新文献

Civil Integrated Management (CIM) for Departments of Transportation, Volume 1: Guidebook 交通部门民事综合管理(CIM)，第1卷:指南

NCHRP Report Pub Date : 2016-11-02 DOI: 10.17226/23690

William J. O'brien, Bharathwaj Sankaran, Fernanda Leite, N. Khwaja, I. D. Palma, Paul M. Goodrum, K. Molenaar, Guillermo Nevett, Joshua Johnson

引用次数: 3

Planning and Preliminary Engineering Applications Guide to the Highway Capacity Manual 公路容量手册的规划和初步工程应用指南

NCHRP Report Pub Date : 2016-09-07 DOI: 10.17226/23632

R. Dowling, P. Ryus, Bastian Schroeder, M. Kyte, F. T. Creasey, N. Rouphail, Ali Hajbabaie, D. Rhoades

引用次数: 8

Leadership Guide for Strategic Information Management for State Departments of Transportation 国家交通部门战略信息管理领导指南

NCHRP Report Pub Date : 2016-08-24 DOI: 10.17226/23480

F. Harrison, M. Gordon, G. Allen

引用次数: 4

Estimating Highway Preconstruction Services Costs. Volume 1: Guidebook 估算公路施工前服务成本。第一卷:旅游指南

NCHRP Report Pub Date : 2016-07-27 DOI: 10.17226/23590

D. Gransberg, H. D. Jeong, E. Craigie, J. Rueda-Benavides, K. Shrestha

引用次数: 4

Estimating Highway Preconstruction Services Costs. Volume 2: Research Report 估算公路施工前服务成本。第二卷:研究报告

NCHRP Report Pub Date : 2016-07-27 DOI: 10.17226/23627

D. Gransberg, H. D. Jeong, E. Craigie, J. Rueda-Benavides, K. Shrestha

引用次数: 1

Navigating Multi-Agency NEPA Processes to Advance Multimodal Transportation Projects 引导多机构NEPA流程推进多式联运项目

NCHRP Report Pub Date : 2016-07-13 DOI: 10.17226/23581

D. Emerson, Doris Lee, C. Cummings, Jennifer Thompson, Bridget Wieghart, Shelly Brown

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引用次数: 0

Guidelines for Nighttime Visibility of Overhead Signs 夜间架空标志可见度指南

NCHRP Report Pub Date : 2016-06-17 DOI: 10.17226/23512

P. Carlson, Bradford K. Brimley, J. Miles, S. Chrysler, R. Gibbons, T. Terry

{"title":"Guidelines for Nighttime Visibility of Overhead Signs","authors":"P. Carlson, Bradford K. Brimley, J. Miles, S. Chrysler, R. Gibbons, T. Terry","doi":"10.17226/23512","DOIUrl":"https://doi.org/10.17226/23512","url":null,"abstract":"This report presents proposed guidelines for nighttime overhead sign visibility, formatted as a potential replacement for the current Chapter 10, Roadway Sign Lighting, in the 2005 AASHTO Roadway Lighting Design Guide. The research for the project was conducted in two phases. In the first phase, a closed-course study was conducted at the Virginia Smart Road at the Virginia Tech Transportation Institute. The goal of this study was to determine legibility distances for drivers in controlled conditions for three different sign legend and background configurations lit by either high pressure sodium or light emitting diode systems or they were unlit. In the second phase, an open-road study was conducted by the Texas AM San Antonio, Texas; and Orlando, Florida. The goal of the open-road study was to determine the effects of sign luminance and visual complexity on the distance at which a driver can read overhead signs and street signs. Both studies employed cohorts of recruited drivers evenly split in terms of gender and age. The closed-course study found that sign lighting does not significantly impact legibility distance of signs in rural and dark areas, suggesting that sufficient illumination for visibility was provided by headlamps. Using software developed for the open-road study, digital images were analyzed to quantitatively measure visual complexity in urban and suburban areas. Visual complexity of sign surroundings was found to reduce the distance at which a driver can correctly recognize information from signs, however, this effect can be countered by increases in the legend luminance. This report fully documents the research and includes four appendixes: Incremental Effects of Light Sources and Sign Sheeting on Legend Luminance for Overhead Guide Signs; Assessment of Background Complexity Using Digital Images of Roadway Scenes by Image Processing; Open-Road Study Details; and Guidelines for Nighttime Overhead Sign Visibility.","PeriodicalId":350472,"journal":{"name":"NCHRP Report","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123475636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Evaluation and Assessment of Environmentally Sensitive Stream Bank Protection Measures 环境敏感性河岸保护措施的评价与评价

NCHRP Report Pub Date : 2016-06-01 DOI: 10.17226/23540

P. Lagasse, P. Clopper, C. Thornton, F. D. Shields, J. McCullah, W. Spitz

引用次数: 1

Guidelines for Certification and Management of Flexible Rockfall Protection Systems 柔性岩崩防护系统认证和管理指南

NCHRP Report Pub Date : 2016-05-18 DOI: 10.17226/23519

B. Arndt, Brett Arpin, J. Higgins, P. Thompson

引用次数: 6

Effective Project Scoping Practices to Improve On-Time and On-Budget Delivery of Highway Projects 有效的项目范围界定实践，以提高公路项目的按时和按预算交付

NCHRP Report Pub Date : 2016-04-20 DOI: 10.17226/23398

S. Anderson, C. Quiroga, J. Overman, Kunhee Choi, J. Sahu, Sharareh Kermanshachi, Paul M. Goodrum, Timothy R. B. Taylor, Ying Li

{"title":"Effective Project Scoping Practices to Improve On-Time and On-Budget Delivery of Highway Projects","authors":"S. Anderson, C. Quiroga, J. Overman, Kunhee Choi, J. Sahu, Sharareh Kermanshachi, Paul M. Goodrum, Timothy R. B. Taylor, Ying Li","doi":"10.17226/23398","DOIUrl":"https://doi.org/10.17226/23398","url":null,"abstract":"This guidebook demonstrates how a state transportation agency (STA) can improve its project scoping process (PSP) and practices to produce a project cost estimate and schedule that facilitate programming decision making and accountability. It illustrates the effort needed to develop a robust cost estimate and then manage to a baseline budget and scope throughout the project delivery cycle. The guidebook consists of two parts. Part 1, “Research Results about the PSP,” addresses the following issues: why STAs should formalize the PSP; current practices for PSP; and how agencies can implement an effective PSP. Part 2, “Implementation Guidelines,” provides an easy-to-understand layout and describes how to implement the PSP. The guidelines are divided into three sections. Each section details one of the three major activities of the PSP—develop the project, analyze the alternatives and document findings, and develop the recommended alternative. The guidelines also have two appendices. The first appendix summarizes the tools that can be used while performing different activities in the scope development process. The second appendix is the list of online links to various resources and tools to support the PSP, as referenced in this guidebook.","PeriodicalId":350472,"journal":{"name":"NCHRP Report","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129040502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14