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.
Documents by TRB
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.
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.
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.
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
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
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:
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).
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
This TRB website provides a gateway to information and resources pertaining to the state-of-the-practice in access management and its integration into established planning, policy, and design processes.
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
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.
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.