Documents in the Category: Effects
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:
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
Classification and Design of Highway At-Grade Intersections
A Compendium Survey of International Access Management Practices and Concepts
Roadway Access Management and its Importance to the Transportation System of Developed and Developing Nations
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
The purpose of the Alabama Department of Transportation (ALDOT) Access Management Manual is to set out standards for managing access to and from state roads and highways.
Goals of access management include:
- protecting the health, safety and welfare of the public
- maintaining the highway rights-of-way
- preserving the functional level of state roads and highways while meeting the needs of the motoring public
Alabama Department of Transportation Access Design and Management Manual
Managing Traffic on Urban Limited Access Facilities. Ingress Through Tolling and Egress to Large Scale Generators as Keys to Relieve Congestion. The Case of Attica Tollway in Athens, Greece
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.
Peter Hsu, P.E.
Florida Department of Transportation
W. T. Bowman, P.E
Tindale-Oliver & Associates, Inc.
- Case Study 1-Nebraska Avenue Lane Diet
- Before: 4-lane undivided
- After: 2-lane divided with TWLTL
- Case Study 2-Hillsborough Avenue Median Installation
- Before: 6-lane with TWLTL
- After: 6-lane with raised medians
Case Study 1: Discussion
This report classifies access management techniques and presents methods for estimating the safety and operational effects of the different techniques. For some techniques, quantitative assessment was not practical and case studies are presented to demonstrate good and poor practice. This report will be very useful to those developing access guidelines and policy and those analyzing specific access situations.
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.
Access Management Performance Measures for Virginia: A Practical Approach for Public Accountability
In order to develop performance measures to communicate the effect of Virginias access management program, five tasks were performed:
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.
Eisele, W. and W. Frawley, Michigan Access Management Program Evaluation, prepared for the Michigan Department of Transportation, Texas Transportation Institute (2010) http://michigan.michigan.gov/mdot/0,1607,7-151-9621_11041_29705---,00.html;
Schultz, G., K. Braley, and T. Boschert. Correlating Access Management to Crash Rate, Severity, and Collision Type, Proceedings of the 87th Annual Meeting of the Transportation Research Board, Washington, DC, (2008)
Schultz, G., K. Braley, and T. Boschert, Relationship between Access Management and Other Physical Roadway Characteristics and Safety, Journal of Transportation Engineering, Vol. 136, Issue 2 (2010)
Pirinccioglu, F., J. Lu, P. Liu and G. Sokolow, Right Turn from Driveways Followed by U-Turn on Four-Lane Arterials: Is It Safer Than Direct Left Turn? Transportation Research Record: Journal of the Transportation Research Board, No. 1953, Washington, D.C. (2006)
Petritsch, T., S. Challa, H. Huang and R. Mussa, Evaluation of Geometric and Operational Characteristics Affecting the Safety of Six-Lane Divided Roadways, Sprinkle Consulting, Incorporated, Florida Department of Transportation, Federal Highway Administration (2007)
Lu, J. and S. Zhu, Development of Models to Predict Conflict Rates at Unsignalized Intersections, Proceedings of the 10th International Conference of Chinese Transportation Professionals (2010)