Documents in the Category: Access Spacing
Crash Risk and Access Spacing on Two-Lane and Multi-Lane Highways
Hitesh Chawla; Peter T. Savolainen, Ph.D., P.E.
Effective access management is essential to mitigating traffic crash risks. Most of the crashes occurring near access points are a result of conflicts between multiple vehicles. This motivates the development of guidelines for access spacing. To this end, this study evaluated the relationship between crash risk and access point spacing on two-lane and multi-lane highways across the state of Iowa.
12th National Access Management Conference Proceedings
Madison Wisconsin, July 17-19, 2018
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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.
Effective local access management requires planning as well as regulatory solutions. Communities should establish a policy framework that supports access management in the local comprehensive plan, prepare corridor or access management plans for specific problem areas, and encourage good site planning techniques. Land development and subdivision regulations should be amended accordingly and communities may also consider a separate access management ordinance.
These standards and guidelines have been developed to establish uniformity for encroachments upon roads in the South Carolina State Highway System so as to provide for the safe and efficient movement of traffic while allowing reasonable access to abutting property. This document does provide a majority of the information needed for encroachments onto the State Highway System.
Recent changes include:
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:
Proceedings of the Second International Conference on Access Management held in Shanghai, China, September 25-27, 2014. Sponsored by the Access Management Committee of the Transportation Research Board; Tongji University; Shanghai Jiaotong University; the Research Institute of the Ministry of Public Security, PRC; the Research Institute of Highway, PRC; the Ministry of Transportation, PRC; and the Construction Institute of ASCE
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
Spacings of Unsignalized Intersections in Urban Areas – an Empirical Approach based on Operational and Safety Requirements
This report presents a study on the influences of select cross-sectional-related design elements (specifically median configurations and bicycle
lanes) and their impact on crash severity and type, as well as the associated driver gap acceptance for turning maneuvers at midblock driveway
locations on urban arterials. The primary goal of this proposed research is to better understand how the median and bicycle lane configurations
can influence safety and operations at driveway locations.
Stover, V.G. Signal Spacing, Technical Memorandum, Center for Urban Transportation Research, (October 2007), unpublished. Available at http://www.cutr.usf.edu/programs/pcm/pub.shtml
This technical memorandum addresses the rationale for spacing of intersections that are signalized and those that might be considered for signalization at some time in the future. It includes draft prototype regulations.
Kaseko, M. and T. Mauga, Evaluating the Impact of Spacing of Median Openings on Traffic Safety of Urban Arterials, 90th Annual Transportation Research Board Meeting, Washington, D.C. (2011)
Dixon, K. and J. Gattis, Influence of Road Cross Section on Access Spacing, Transportation Research Board of the National Academies, Washington, D.C., Oregon Transportation Research and Education Consortium (in progress)