Resources

Development of Left-Turn Warrants for Unsignalized Intersections

  • Posted on: Fri, 08/30/2013 - 23:14
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Bill Eisele
Development of Left-Turn Warrants for Unsignalized Intersections
TTI

Purpose of NCHRP Project 3-91

  • Develop objective and clear process for selection of left-turn lanes at unsignalized intersections
  • Provide guidance on the design of left-turn lanes

Conclusions

Access Management in Tennessee

  • Posted on: Fri, 08/30/2013 - 23:11
  • By: fbroen
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Marshall Elizer

Tanisha Hall
Tennessee DOT
 

Overview

  • Purpose of Tennessee’s Corridor Management Project
  • Project Overview & Process
  • The Selected Tool: Corridor Management Agreements (CMAs)
  • Reactions-to-Date & Next Steps

Remaining Challenges:

  • Explaining CMAs to key stakeholders
  • Getting CMAs approved
  • Implementing the CMAs
  • Establishing long-lasting partnerships and processes immune to local and state political changes

Access Management in Mississippi

  • Posted on: Fri, 08/30/2013 - 23:09
  • By: fbroen
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Parting Observations

  • Applying AMM principles on newly developing highways will not be that difficult
  • Applying AMM principles consistently on existing highways is proving to be a huge challenge, especially for the Appeals Committee
  • One of biggest challenges is moving past the “we’ve always allowed two driveways” mindset

Hurdles Yet to Overcome

  • The LPA Question – ?
  • Developing an Access Management Practice versus an Access Management Policy

Massachusetts Access Management Design

  • Posted on: Fri, 08/30/2013 - 23:04
  • By: fbroen
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Massachusetts DOT

Outline

  • Functional Classification System
  • Land Use Controls
  • Corridor Planning
  • Permitting
  • Project Design

Where do we go next

  • Complete Streets training,
  • Expanding adoption to private developers getting permits,
  • Training for municipalities
  • Benefits of Multimodal system to AM
  • Implement Guidelines
  • Performance Measures

Oregon’s Interchange Area Management Plans

  • Posted on: Fri, 08/30/2013 - 23:01
  • By: fbroen
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Oregon’s Interchange Area Management Plans — A 10-Year Retrospective
Kittleson and Associates

Conclusions

  • A powerful planning tool
  • Proactively addresses land use, access, and design issues
  • Public process and development techniques need to be naturally transparent
  • The IAMP can formally or informally be applied to all jurisdictions

Access Control near Highway Interchanges

  • Posted on: Fri, 08/30/2013 - 22:55
  • By: fbroen
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Objectives

  • Review origin of current guidelines for access separation from interchange ramps
  • Review recent Virginia study on the relationship between access spacing from interchange ramps and crash rates
  • Suggest new standards for the optimum access point spacing

 

Findings and Recommendations: Access Spacing from Interchange Ramp

A New Look at Driver Perception - Reaction Time at Driveways

  • Posted on: Fri, 08/30/2013 - 22:53
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Oregon State University
AM1220Dixon

As part of the AMAG project, Karen Dixon used a driving simulator to study the driver perception - reaction time of drivers of different ages. 

Overview

  • Defining the Problem
  • Study Currently in Progress
  • Concluding Remarks

Next Steps

US DOT Strategic Plan Update

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As stakeholders, the U.S. Department of Transportation has asked that TRB make sure you are aware of the online dialogue taking place related to the department’s strategic plan for FY 2014 to FY 2018. 

A posting on the U.S. DOT’s website says that “we want to ensure that our strategic plan serves as a foundation for building, operating, and maintaining a safe and efficient transportation system.  We also want to ensure that all of our stakeholders have an opportunity to read the plan and weigh in.”

Learn

What do you want to learn?

This site has hundreds of presentations to learn from. and They are delivered as Adobe Flash presentations, recorded with audio/video from past National Access Management conferences.

Sample

Here are specific items the TRB committee finds particularly interesting. These  documents and presentations have been popular on the website. As users discover resources and provide  more "Like" ratings, they will be featured on the sample page.

Browse

This website is built as pages that describe the information you can find. Each searchable 'page' typically describes one item that is accessed by a link to the PDF document or A/V presentation. Typically you will browse the site fo find to descriptions about a topic, and then click on a link to the actual information. There are several options to locate what you want:

Guided Tour

COMING SOON: There will be a guided tour of the website to help you get started. The Browse page has basic information that will help you get started. The graphic displays the concept that we would like to implement, by helping guide you to information that will help you. By answering simple questions, you will be guided to the content that will help you find what you are looking for.

For example, this flow chart would lead to these 3 links

A: Safe access is good  for business

Conference

Conference Subcommittee Mission Statement:       

It is the mission of this subcommittee to host national and international conferences to support the increase of awareness and use of access management.

Strategic Goals and Objectives:

Research

Research Subcommittee Scope

The Access Management Research Subcommittee will continually strive to advance the state-of-the-practice and state-of-knowledge related to access management through the completion and dissemination of access management planning, policy, and design research.

 

Research Subcommittee AHB70(2) 

Outreach

Outreach Subcommittee Mission Statement:       

It is the mission of this subcommittee to support the increase of awareness and use of access management.

 Outreach Subcommittee AHB70(3) 

Mission

Mission Statement

The Access Management Committee will continually strive to increase the awareness and use of access management.

Committee Scope

The Committee will share the latest knowledge, expertise and experience to facilitate leadership and partnerships to advance the state-of-the-practice in access management and its integration into established planning, policy and design processes. (revised March 2006)

Commitee Objectives

Website Feedback

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We want your feedback. Under the words Access Management in the banner, the tagline is: Balancing Thru Movement and Property Access.
Is this a good tagline? Please propose something better.

Color Pallet for website showing RGB values

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.

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. 

NCHRP Synthesis 348: Improving the Safety of Older Road Users

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TRB's NCHRP Synthesis 348: Improving the Safety of Older Road Users examines programs and policies in place across the country to improve the safety and mobility of older road users. The report documents a range of strategies and related programs under way in roadway engineering, driver licensing, public information and education, and enforcement and adjudication.

 

10 Principles

  • Posted on: Sat, 08/03/2013 - 14:17
  • By: fbroen
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This animation explains the 10 principles from the TRB Access Management Manual published in 2003. Click on each principle to learn more.

Access management is much more than driveway regulation. It is the systematic control of the location, spacing, design and operation of driveways, median openings, interchanges and street connections. It also encompasses roadway design treatments such as medians and auxiliary lanes, and the appropriate spacing of traffic signals.

Regional Implementation of Access Management

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The Maricopa Association of Governments (MAG) conducted a survey of Metropolitan Planning Organizations (MPOs) to assess the implementation of access management at the regional level. The intent of the survey was to determine if access management was being implemented at the regional level; what had been implemented; and how implementation was achieved. Survey responses were divided into three categories: all respondents, respondents serving a population of one million or more (population subset), and respondents serving 25 or more member agencies (agency subset).

Development of the Des Moines Access Management Plan

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Plazak, D., A. Garms, and J. Rees, Development of the Des Moines Access Management Plan, prepared for the Iowa Department of Transportation, Iowa State University (2004);   [Plazak, D., A. Garms, and J. Rees, “Access Management Plan and Program for Des Moines, Iowa, Metropolitan Area,” Transportation Research Record: Journal of the Transportation Research Board, No 1981, Transportation Research Board of the National Academies, Washington, D.C. (2006); Plazak, D., A. Garms, and J.

Update of Florida Crash Reduction Factors and Countermeasures to Improve the Development of District Safety Improvement Projects

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Gans, A., J. Shen, and A. Rodriguez, Update of Florida Crash Reduction Factors and Countermeasures to Improve the Development of District Safety Improvement Projects, prepared for the Florida Department of Transportation, (April 2005)

      This report includes numerous citations of operational and geometric modifications impact crash types. Some of which are access management related.

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