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 in the Category: Interchange
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 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.
Imagine a multilane urban/suburban roadway where traffic is heavy, yet moves well; accommodates drivers, pedestrians, and bicyclists; allows easy entry to and exit from businesses and other destinations; and has fewer crashes and other conflicts. Chances are this road is benefitting from corridor access management, a strategy that seeks an appropriate balance between the safety and mobility of a roadway facility with the access needs of adjacent land uses.
TRH 26 South African Road Classification and Access Management Manual
Technical Recommendations for Highways:
The Intersections Joint Subcommittee has an online manual that provides state of the art guidance on unsignalized intersections.
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:
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
Interchange Area Master Plans
Research on Driving Safety of Urban Interchange Ramp under Crosswind
Presentations from ICAM 2014 Sept 25-26, 2014
Younjie Zhang, Vice Chairman and Secretary-General of Shanghai Highway & Transportation Society
Marc Butorac, Chair TRB Committee on Access Management Opening Remarks
Richard Cunard, TRB Representative
Hangie Lin, Vice Dean, School of Transportation Engineering, Tongji University
FHWA Policy Statement. Access to the Interstate System, Federal Register/Vol. 74, No. 165/ Thursday, August 27, 2009/Notices.
Interstate System Access Informational Guide, U.S. Department of Transportation, Federal Highway Administration Office of Infrastructure (2010)
Zhou, H., K. Williams and W. Farah, Methodology to Evaluate the Effects of Access Control near Freeway Interchange Areas, Journal of Transportation Engineering, Vol. 134, Issue 12 (2008)
Williams, K., H. Zhou, and W. Farah, Costs and Benefits of Strategic Acquisition of Limited Access Right-of-Way at Freeway Interchange Areas, prepared for the Florida Department of Transportation, (2004)
A Policy on Design StandardsInterstate System, American Association of State Highway and Transportation Officials, Washington, D.C., July 1991).
Wikipedia Article: 7/9/13
Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication A Policy on Design Standards - Interstate System. For a certain highway to be considered an Interstate, it must meet these construction requirements or obtain a waiver from the Federal Highway Administration.
These guidelines do not establish ramp and interchange spacing standards. Rather they provide a process and criteria for assessing spacing in a given context to assist planners and designers in considering the feasibility of new or rebuilt interchanges and ramps. Interchange spacing is defined as the distance between the centerlines of successive crossroads with interchanges on a freeway.
Rakha, H., A. Flintsch, M. Arafeh, G. Abdel-Salam, D. Dua and M. Abbas, Access Control Design on Highway Interchanges, Virginia Polytechnic Institute and State University, Blacksburg, Virginia Department of Transportation, Virginia Transportation Research Council (2008)
This project applied analytical tools (regional economic forecasting models, GIS, transportation planning software, and traffic simulation software) to inform the planning and development process along an emerging interstate highway corridor. It illustrated the benefits of advanced planning and access management intended to preserve the functional integrity of the corridor and its interchanges and crossroads.
Butorac, M., and J. Wen, NCHRP Synthesis 332: Access Management on Crossroads in the Vicinity of Interchanges, Transportation Research Board of the National Academies, Washington, D.C. (2004)
This study documented practices and standards relative to access location and design on the crossroads in the vicinity of interchanges, both for new interchanges and retrofit of existing interchanges. It provides guidance relative to factors that may be considered when assessing crossroad and mainline spacing near interchanges.