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: Medians
Transportation professionals today are faced with the challenge to meet the mobility needs of an ever increasing population with limited resources. One potential treatment to mitigate congestion and safety problems at rural expressway intersections, while trying to avoid signalization or grade‐separation, is the J‐Turn intersection treatment, which has been successfully implemented in Michigan, Florida, Maryland, New Jersey, and Louisiana.
FHWA Tri-fold Summary of 8 Page Brochure
Safety Benefits of Raised Medians and Pedstrian Refuge Areas
This compliation of documents are provided to FDOT staff to help them implement access management in Florida.
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
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
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.
Freeway access management activities have traditionally taken a nominal approach to safety. Acceptable safety performance is presumed to result from attaining some desired interchange or ramp spacing. This approach oversimplifies driver behavior and complex interactions between roadway geometrics, traffic operations, and safety. The objective of this paper is to quantify the relationship between ramp spacing and freeway safety, with safety defined as number of accidents, or accident consequences, by kind and severity, expected to occur during a specified time period.
TRBs National Cooperative Highway Research Program (NCHRP) Report 650: Median Intersection Design for Rural High-Speed Divided Highways explores common safety issues at median intersections on rural divided highways, and examines innovative geometric and operational treatments for addressing those issues. The report includes ten case studies that illustrate how various treatments have been applied in the field.
The use of raised medians in urban areas has increased in recent years. Raised medians restrict access to businesses along a corridor by limiting turning movements to select mid-block locations. Therefore, a very common remark at public hearings related to the construction of raised medians is that there will be detrimental economic impacts on adjacent businesses. However, the restricted access allows more efficient signalization and traffic flow along the corridor, potentially providing more customers for the businesses.
Fernandez, J., & L. Marcus. Network Planning: Developing a Multimodal Approach. ITE Journal, (2009) pp. 30-39.
Institute of Transportation Engineers. Planning Urban Roadway Systems: An ITE Proposed Recommended Practice, Washington, D.C. (2011)
Schultz, G., D. Thurgood, A. Olsen and C. Reese, Analyzing Raised Median Safety Impacts Using Bayesian Methods, Transportation Research Record: Journal of the Transportation Research Board, No. 2223, Transportation Research Board of the National Academies, Washington, D.C. (2011)
North Carolina Department of Transportation, Median Crossover Guidelines, (January 2004)
Lu, J., P. Liu, and F. Pirinccioglu, Determination of the Offset Distance between Driveway Exits and Downstream U-turn Locations for Vehicles Making Right Turns Followed by U-turns, Report Sponsored by the Florida Department of Transportation, Tallahassee, Florida (2005)
Hovey, P., R. Chowdhury, Y. Zhou, and R. Fries, Evaluating the Safety Performance of Adding a Two-way Left-turn Lane to an Undivided Cross-section, Journal of Public Works and Infrastructure, Vol. 2, Issue 4 (2010)