Documents by TRB

Combined AMAG & AM Manual

up
Click here if you liked this information

 TRB's newest publications on access management draw on national and state research to respond to the need for a more coordinated approach to transportation and community design that preserves the safe and efficient movement of peoples and goods, provides supporting networks in developed areas, and reinforces desired urban form.

TRB 5th International Conference on Roundabouts

up
Click here if you liked this information

TRB sponsored the 5th International Conference on Roundabouts which took place on May 8-10, 2017, in Green Bay, Wisconsin. The conference focused on research, design, operation, safety, evaluation, and practical experience with the increasingly used roundabout form of an intersection. Visit the proceedings website to view the presentations,  final program.

An Expanded Functional Classification System for Highways and Streets

up
Click here if you liked this information

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Research Report 855: An Expanded Functional Classification System for Highways and Streets. This report builds upon preliminary engineering of a design project, including developing the purpose and need. In particular, it provides additional contexts beyond urban and rural, facilitates accommodation of modes other than personal vehicles and adds overlays for transit and freight.

Access Management Application Guidelines (AMAG)

up
Click here if you liked this information

TRB's Access Management Application Guidelines (AMAG) focuses on the applications of access management concepts and provides research-based guidelines on access management treatments and procedures for their applications. The AMAG is a how-to tool for continuing the evolution of access management applications in the United States.

International Practice in Highway Access Management: A Primer

up
Click here if you liked this information

TRB E-Circular 214: International Practice in Highway Access Management: A Primer explores the international status of access management through the use of a survey of transportation researchers or professionals from eight countries to document their understanding of access management practices in their country. Authors of each country report were asked to focus on critical issues of the concept and provide specific information (if existing) with regard to historical background; legal framework; roadway function; access control schemes; land use and development regulation; enforcement schem

Roundabout Practices

up
Click here if you liked this information

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 488: Roundabout Practices summarizes roundabout policies, guidance, and practices within state departments of transportation (DOTs) as of 2015. The synthesis may be used as a reference for state agencies that are creating or updating their roundabout and intersection control policies.

Project: Project Information

Operational Effects of Geometrics and Access Management, 2015

up
Click here if you liked this information

Operational Effects of Geometrics and Access Management, 2015

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2486, explores 10 papers related to operational effects of geometrics and access management in the transportation sector, including:

2015 Seattle Presentations Menu

up
Click here if you liked this information

Presentations from the 11th National Access Management Conference held in Seattle Washington on September 21-23 in conjunction with the AASHTO Subcommittee on Design (SCOD).

General Session

Moderator/AASHTO SCOD Welcome: Carlos Braceras, Chair Utah

Washington State Welcome:  Lynn Peterson, Secretary WSDOT

FHWA Welcome: Dan Mathis, Washington Division Office FHWA

AASHTO Update: Jim McDonnell, AASHTO

Access Management Manual 2014 - 2nd Edition

up
Click here if you liked this information

TRB’s Access Management Manual, second edition, provides guidance on a coordinated approach to transportation and community design that is designed to help enhance mobility, provide greater mode choice, and improve environmental quality. The content is interdisciplinary, with guidance pertinent to various levels of government as well as to pedestrians, bicyclists, and motorized vehicles, including trucks and buses. Access management is addressed comprehensively, as a critical part of network and land use planning. Key updates include

The Relationship Between Access Density and Accident Rates: Comparisons of NCHRP Report 420 and Minnesota Data

up
Click here if you liked this information

This digest summarizes findings of National Cooperative Highway Research Program (NCHRP) Project 3-52A, "Impacts of Access-Management Techniques." NCHRP Report 420, "Impacts of Access Management Techniques" (1999), presents relationships between access density and accident rates. This digest uses additional data from Minnesota to confirm these relationships. The digest is organized as follows: Introduction; Problem Statement; Objective and Approach; Background; Results; Comparisons; and Accident Rate Indices. 

Modeling Operating Speed

up
Click here if you liked this information

TRB’s Transportation Research E-Circular E-C151: Modeling Operating Speed is a synthesis of existing operating speed models developed in different regions of the world. The models are grouped according to roadway type. 

Limitations and deficiencies in existing operating speed models and suggestions for future work are also identified. 

Practitioner perspectives on the potential use of speed prediction models in road design practice are provided from both the perspective of the United States and the international community.