Documents in the Category: Medians

Combined AMAG & AM Manual

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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.

MS DOT Synthesis of J-Turn Design Standards and Criteria

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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.

Access and Roadside Management Standards

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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:

Access Management Application Guidelines (AMAG)

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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.

Corridor Access Management

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FHWA/Safety/Intersection/Intersection Safety

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.

Second International Conference on Access Management Proceedings 2014

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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

Access Management Manual 2014 - 2nd Edition

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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

2014 Proceedings from International Conference on Access Management Shanghai China

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Presentations from ICAM 2014 Sept 25-26, 2014

YouTube Video from Opening Ceremony

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

Influence of Road Cross Section on Access Spacing

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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.

Performance-Based Safety Evaluation of Requests for New Access or Modifications to Existing Access on Freeways

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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.

NCHRP 650: Median Intersection Design for Rural High-Speed Divided Highways

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TRB’s 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.

Raised Medians and Economic Impact on Adjacent Businesses

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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.

Analyzing Raised Median Safety Impacts Using Bayesian Methods

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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)

Determination of the Offset Distance between Driveway Exits and Downstream U-turn Locations for Vehicles Making Right Turns Followed by U-turns

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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) 

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