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NCHRP 420Operational and Institutional Agreements That Facilitate Regional Traffic Signal Operations

Accession Number:01352483

Record Type:Monograph

Record URL:http://onlinepubs.trb.org...bs/nchrp/nchrp_syn_420.pdf

Availability:Transportation Research Board Business Office

500 Fifth Street, NW

Washington, DC 20001 USA

Order URL: http://www.trb.org/Main/Blurbs/166052.aspxFind a library where document is available

Order URL: http://worldcat.org/isbn/9780309143394

Abstract:Regional Traffic Signal Operations Programs (RTSOPs) are a tool that regions can use to improve traffic flow as it crosses from one jurisdiction to another. One central focus of these programs is coordination of signal timing on multi-jurisdictional arterials. Another benefit is the creation of a central forum for consideration of other traffic operations measures to improve regional mobility. Although many RTSOPs have been established through regional metropolitan planning organizations, successful RTSOPs have been established by other organizations, including state and local departments of transportation, and government corporations. Information for this study was gathered through a literature review, a survey of RTSOPs, and selected interviews.

Supplemental Notes:Appendix D is web-only and can be found at www.trb.org by searching on "NCHRP Synthesis 420."

Report/Paper Numbers:Project 20-05, Topic 41-07

NCHRP 422Trade-Off Considerations in Highway Geometric Design

Accession Number:

01355863

Record Type:

Monograph

Record URL:

http://onlinepubs.trb.org...bs/nchrp/nchrp_syn_422.pdf

Availability:

Transportation Research Board Business Office



Order URL: http://www.trb.org/Main/Blurbs/166100.aspx

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Abstract:

This synthesis describes the processes that transportation agencies currently use to evaluate geometric

design trade-offs between competing interests. It also highlights existing key publications on conventional

approaches, context-sensitive solutions/context-sensitive design, and performance-based approaches, as

well as gaps in information or analysis processes available to support design decisions. The audience for

this report includes practitioners in transportation project development and delivery. Information used in

this study was acquired through a review of the literature and surveys.

Report/Paper Numbers:

Project 20-05 (Topic 40-07)

NCHRP 423Long-Term Performance of Polymer Concrete for Bridge Decks









Abstract:Thin polymer overlays (TPOs) consist of a polymer binder and aggregates with a thickness not exceeding 25 mm (1 in.). They have provided long-lasting wearing surfaces for bridge decks with many advantages, including adding very little dead load; very fast cure times; shallow depths that eliminate the need for raising approach slabs; ability to transition from overlaid lane to non-overlaid lane during construction; low permeability; and good frictional resistance. This study found that TPOs have become an accepted construction method for deck preservation, restoring surface friction and extending the lives of decks. When constructed properly on sound decks, TPOs should provide a service life of 20 or 25 years. Information was gathered through literature review, a survey of all state transportation agencies, and selected interviews.

Report/Paper Numbers:Project 20-05 (Topic 39-11)

NCHRP 424Engineering Economic Analysis Practices for Highway Investment



Blurb URL:http://www.trb.org/Main/Blurbs/167096.aspx





Order URL: www.trb.org/Main/Blurbs/167096.aspxFind a library where document is available


Abstract:This study has looked at how U.S. transportation agencies have applied engineering economics (benefit–cost analyses and similar procedures) to decisions on highway investments. State departments of transportation (DOTs) are most likely to use economic methods when considering investments in pavement and bridge preservation, safety improvements, and major projects on trunk lines and in urban areas. This study, however, has found agencies that use economic information across their key business and decision processes. Information was gathered through literature review, presentations at conference committee meetings, a screening survey of state DOTs, and interviews leading to case studies.


NCHRP 425Waterproofing Membranes for Concrete Bridge Decks










Abstract:The objective of this synthesis study was to update NCHRP Synthesis of Highway Practice 220, "Waterproofing Membranes for Concrete Bridge Decks," a report on the same topic published in 1995. This synthesis documents information on materials, specification requirements, design details, application methods, system performance, and costs of waterproofing membranes used on new and existing bridge decks since 1995. The synthesis focuses on North American practices with some information provided about systems used in Europe and Asia. Information used in this study was acquired through a review of the literature and surveys of state departments of transportation and Canadian provincial transportation agencies. For additional details, follow-up interviews were conducted with several agencies.


NCHRP 426Performance-Based Highway Maintenance and Operations Management



Record URL:http://www.trb.org/Main/Blurbs/167221.aspx






Abstract:This synthesis examines current performance-based management practices that are applied by state departments of transportation (DOTs) in highway maintenance and operations (M&O). Past studies have focused on the elements that make up a performance-based M&O approach, such as condition ratings, levels of service, performance measures, and threshold values. This study focuses on how state DOTs actually use performance-based measures to manage their highway programs. Information used in this study was acquired through a review of the literature, a survey of state DOTs, and follow-up interviews with four state DOTs to develop case examples of highway M&O performance management.


NCHRP 427

Extent of Highway Capacity Manual Use in Planning








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Abstract:The Highway Capacity Manual (HCM), a publication of the Transportation Research Board, is used for a variety of transportation facility and traffic engineering applications. This study reports on the current use of the HCM in transportation planning by federal, state, regional, and local agencies. The scope includes performance monitoring, problem identification, project prioritization, programming, and decision-making processes. Information was gathered through a literature review, a survey of selected agencies, and in-depth interviews.


NCHRP 428Practices and Procedures for Site-Specific Evaluations of Earthquake Ground Motions










Abstract:This study identifies and describes current practice and available methods for evaluating the influence of local ground conditions on earthquake design ground motions on a site-specific basis. Information includes criteria used to determine when a site-specific analysis is needed, how to develop input parameters required for a site-response analysis, the nature of the site-response analysis performed (equivalent-linear, total stress nonlinear, effective-stress nonlinear), the process of model setup, and how uncertainties are dealt with in the analysis process. Information was gathered by a literature review and a survey of state departments of transportation and selected academics.


NCHRP 429

Geotechnical Information Practices in Design-Build Projects







Find a library where document is availableOrder URL: http://worldcat.org/isbn/9780309223560

Abstract:Use of the design-build project delivery method by state agencies for transportation projects is increasing each year. This study reviews how states use geotechnical information in solicitation documents and contracts for design-build highway projects. The report examines current practices regarding the allocation of geotechnical risk and the level of geotechnical information provided with bid documents, the scope of geotechnical information required after contract award, geotechnical-related performance testing during construction, and contract provisions related to geotechnical design and construction. Information used in this study was gathered through a literature review, a survey of state departments of transportation (DOTs), analysis of design-build policy guidelines and solicitation documents from state DOTs, and interviews with design-build contractors. The report also provides case studies on legal and engineering geotechnical issues.


NCHRP 431

Practices to Manage Traffic Sign Retroreflectivity







Order URL: http://http://www.trb.org/Main/Blurbs/167037.aspxFind a library where document is available


Abstract:“Traffic sign retroreflectivity” is a sign property which, during nighttime, causes light from a vehicle’s headlamps to be reflected back to the driver, giving the sign an illuminated appearance. The federal government has established guidance to ensure that agencies responsible for traffic signs will bring their signs up to an acceptable standard of retroreflectivity. The objective of this study is to provide examples of effective practices that illustrate how different types of agencies can meet the retroreflectivity requirements. Information was gathered through a literature review and telephone surveys. Case studies are included for four different agencies that participated in the survey.


NCHRP 432

Recent Roadway Geometric Design Research for Improved Safety and Operations










Abstract:This synthesis report is an update of NCHRP Synthesis of Highway Practice 299 on the same topic published in 2001. It reviews and summarizes selected roadway geometric design literature completed and published from 2001 through early 2011, particularly research that identified impacts on safety and operations. The report is structured to correspond to chapters in AASHTO’s "A Policy on Geometric Design of Highways and Streets," more commonly referred to as the Green Book. Information for the synthesis study was collected using an extensive literature review and analysis.


NCHRP 434Use of the U.S. Census Bureau's Public Use Microdata Sample (PUMS) by State Departments of Transportation and Metropolitan Planning Organizations









Abstract:Census microdata are the confidential records of specific individuals and housing units from whom Decennial Census or American Community Survey responses have been obtained. The U.S. Census Bureau also draws a sample from the full set of microdata and makes these sampled records available in the Public Use Microdata Sample (PUMS) data products, so that users can develop their own tabulations. These data are being used by state departments of transportation (DOTs) and metropolitan planning organizations (MPOs) for studies, such as analyses of the commuting characteristics of population subgroups, and for supporting travel demand models and land use models. Information for this study of PUMS use was gathered by literature review, survey of selected state DOTs and MPOs, and in-depth interviews.


NCHRP 437Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls










Abstract:Mechanically stabilized earth (MSE) walls are retaining walls that rely on internal reinforcement embedded in the backfill for stability. This study addresses methods currently used to assess long-term performance of MSE walls, where "long-term" denotes the period of time from approximately one year after the wall is in service until the end of its design life. The focus of the study is on state and federal agency wall inventories, including methods of inspection and assessment of wall conditions. Information was gathered through a literature review, agency survey, and selected interviews.

Supplemental Notes:Appendix E is included on the Web version of this report, making the total pages 211.


NCHRP 438Expedited Procurement Procedures for Emergency Construction Services










Abstract:Faced with disasters that close highways to the traveling public, state departments of transportation (DOTs) must undertake emergency procurement procedures to repair and reopen roadways. These procedures provide expedited delivery of contractor services. This study reports and discusses emergency procurement procedures being utilized by state DOTs, in coordination with federal agencies. Information for the study was gathered through a literature review and a survey of state DOTs and Federal Lands Highway Divisions. The study includes legal case studies.


Language:English

Authors:Gransberg, Douglas DLoulakis, Michael C

Pagination:114p

NCHRP 440Performance-Based Seismic Bridge Design








Order URL: http://www.trb.org/main/blurbs/168670.aspxFind a library where document is available


Abstract:Performance-based seismic design (PBSD) for bridges is a design process that links decision making for facility design rationally and scientifically with seismic input, facility response, and potential facility damage. The goal of PBSD is to provide decision makers and stakeholders with data that will enable them to allocate resources for construction based on levels of desired seismic performance. PBSD is an advance over current prescriptive bridge design methodologies. This report summarizes the current state of knowledge and practice for PBSD. Information for this study was acquired through literature review and a survey of state departments of transportation.


NCHRP 441High Performance Concrete Specifications and Practices for Bridges









Abstract:This synthesis documents the types of specifications and practices used by state transportation agencies to produce high performance concrete for bridges. The report also identifies specifications and practices reported as having improved concrete performance and those that have been less successful. Information used in this study was acquired through a review of the literature, a survey of state departments of transportation (DOTs), and follow-up interviews with selected state DOTs.


NCHRP 442Practical Highway Design Solutions

Accession Number:

01475128

Record Type:

Monograph

Blurb URL:

http://www.trb.org/Main/Blurbs/168619.aspx

Record URL:

http://onlinepubs.trb.org...bs/nchrp/nchrp_syn_443.pdf

Availability:

Transportation Research Board Business Office



Order URL: http://www.trb.org/Main/Blurbs/168619.aspx

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Abstract:

Some state departments of transportation (DOTs) have adopted design solutions—often labeled

"practical design"—for specific roadway projects at reduced costs, thereby allowing the agencies to better

address critical needs of the entire roadway system. This synthesis presents information on the

application of practical design approaches in roadway project development. Information used in this study

was acquired through a review of the literature, a survey of state DOTs, and follow-up interviews with six

state DOTs that have adopted formal practical design policies.

Report/Paper Numbers:

Project 20-05, Topic 43-05

NCHRP 443

Practical Highway Design Solutions










Abstract:Some state departments of transportation (DOTs) have adopted design solutions—often labeled "practical design"—for specific roadway projects at reduced costs, thereby allowing the agencies to better address critical needs of the entire roadway system. This synthesis presents information on the application of practical design approaches in roadway project development. Information used in this study was acquired through a review of the literature, a survey of state DOTs, and follow-up interviews with six state DOTs that have adopted formal practical design policies.


NCHRP 447

Synthesis of Information Related to Highway Problems. Topic 43-10. Active Traffic and Demand Management Strategies for Arterials Roadways


Record Type:Project

Record URL:http://apps.trb.org/cmsfe...Display.asp?ProjectID=3220

Abstract:The Transportation Research Board's (TRB's) National Cooperative Highway Research Program (NCHRP) Synthesis 447: Active Traffic Management for Arterials practices associated with the design, implementation, and operation of active traffic management (ATM) on arterial roadways. ATM includes a suite of strategies that are used to manage traffic flow in order enhance capacity and safety.

Contract Numbers:Proejct 20-05, Topic

Language:English

Sponsor Organizations:Federal Highway Administration

1200 New Jersey Avenue, SE

Washington, DC 20590 United States

American Association of State Highway & Transportation Officials444 North Capitol Street, NW, Suite 225


National Cooperative Highway Research Program (NCHRP) SynthesisTransportation Research Board


Washington, DC 20001

Project Managers:Gause, Jo Allen

NCHRP 461

Accelerating Implementation of Transportation Research ResultsTRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 461: Accelerating Implementation of Transportation Research Results examines implementation practices used by public-sector nontransportation agencies, nonprofits, and academia to accelerate practical application of research results. The emphasis is on practices that might be useful for transportation agencies to create more responsive research programs.

Project: Project Information

Project Number: 20-05/Topic 41-06

E-Newsletter Type: Recently Released TRB Publications

TRB Publication Type: NCHRP Synthesis Report

http://www.trb.org/Main/Blurbs.aspx?fields=PublicationType%7CNCHRP%20Synthesis%20Report

http://www.trb.org/Main/Blurbs.aspx?fields=ENewsletterType%7CRecently%20Released%20TRB%20Publications

http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=2744

NCHRP 466

Alliance Contracting—Evolving Alternative Project DeliveryTRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 466: Alliance Contracting—Evolving Alternative Project Delivery synthesizes current practices related to the use of alliance contracts around the world, and explores the procurement procedures that have been used to successfully implement alliance contracting on typical transportation projects.





This Summary Last Modified On: 2/13/2015




NCHRP 468

Interactive Training for All-Hazards Emergency Planning, Preparation, and Response for Maintenance and Operations Field PersonnelTRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 468: Interactive Training for All-Hazards Emergency Planning, Preparation, and Response for Maintenance and Operations Field Personnel identifies interactive emergency training tools and sources that may be applied by maintenance and operations field personnel of state departments of transportation and public works agencies. The report also identifies potential obstacles to their implementation and develops a toolkit of relevant training and exercise information.








NCHRP 469

Impacts of Energy Developments on U.S. Roads and Bridges









Order URL: http://worldcat.org/isbn/9780309271592Abstract:This report documents the economic impact of heavy truck traffic related to energy development on the nation’s roads and bridges. Strategies used by transportation agencies to minimize and pay for the damage caused by heavy loads are also documented. Information used in this study was acquired through a review of the literature, a survey of state transportation agencies, and interviews with selected federal and tribal agencies. Follow-up interviews with multiple agencies in five states selected for further study provided additional information. Chapter 1 provides an introduction to the report. Chapter 2 presents a literature review of energy development activities in the United States, highlighting energy development industries in the U.S., costs and revenue sources for public agencies, impacts on public roads and bridges as a result of energy development, strategies used by federal agencies and states, practices reported by federal agencies, and practices reported by tribal nations. Chapter 3 summarizes a survey on energy development impact on state and local roads and bridges, highlighting impact on infrastructure, engineering tools and design standards, economic impacts of energy development on roads and bridges, tools used to assess costs, impacts on roadway safety and operations, and defining the challenges to agencies. Chapter 4 presents case examples of state and local practices used to address energy development impacts in Colorado, Iowa, North Dakota, Pennsylvania and Texas. Chapter 5 presents a conclusion and identifies knowledge gaps.

http://worldcat.org/isbn/9780309271592


http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_syn_469.pdf


NCHRP 475

Fiber Additives in Asphalt MixturesTRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 475: Fiber Additives in Asphalt Mixtures summarizes the types of fibers used in asphalt mixtures, their properties, how they are tested, how they are applied, and lab and field performance of the fiber mixes.








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