Documents in the Category: Effects

Operational Effects of Geometrics and Access Management, 2015

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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:

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

Alabama Access Management Manual

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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

1 Introduction

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.

Safety Impacts of Access Management: Two Case Studies

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Peter Hsu, P.E.

Florida Department of Transportation

District 7

 

W. T. Bowman, P.E

Tindale-Oliver & Associates, Inc.

Tampa, FL

Presentation Outline

  • 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

NCHRP Report 420 Impacts of AM Techniques

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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. 

The Relationship Between Access Density and Accident Rates: Comparisons of NCHRP Report 420 and Minnesota Data

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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. 

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.

Right Turn from Driveways Followed by U-Turn on Four-Lane Arterials: Is It Safer Than Direct Left Turn?

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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)

Evaluation of Geometric and Operational Characteristics Affecting the Safety of Six-Lane Divided Roadways

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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)

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