Resources

AM18 Poster Hitesh Chawla

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Crash Risk and Access Spacing on Two-Lane and Multi-Lane Highways

Hitesh Chawla; Peter T. Savolainen, Ph.D., P.E.

 

INTRODUCTION

Effective access management is essential to mitigating traffic crash risks. Most of the crashes occurring near access points are a result of conflicts between multiple vehicles. This motivates the development of guidelines for access spacing. To this end, this study evaluated the relationship between crash risk and access point spacing on two-lane and multi-lane highways across the state of Iowa.

AM18 Poster Beiia Zhang

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Access Management to Reduce Wrong-Way (WWD) Driving on Alabama Divided Highways

Beijia Zhang

 

A divided highway is considered as a highway with physical separation, and the side streets are its access points in this study.

WWD crashes are more possible than other kinds crashes to result in fatal or incapacitating injuries. The majority of previous studies are focused on freeways instead of divided highways.

112 WWD crashes were identified in Alabama divided highways from 2009 to 2013.

AM18 Poster Dan Xu (1st Place Poster Award)

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Interchange Deceleration Lane Design Based on Naturalistic Driving Speed and Deceleration Rates

Dan Xu (1st Place Poster Award Winner) and Chennan Xue

(Poster updated 8/1/2018)

The Green Book provides the minimum lengths of deceleration lanes. The length recommendations provided by the 2011 edition are similar to the documents published in 1965, which were based on the data collected in the 1930s and had not been updated. (Fitzpatrick et al., 2012; Abdelnaby, 2014) Data was obtained from NDS dataset, including Video and Time Series Report.

AM18 Poster Md Atiquzzaman (2nd Place)

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Access Control and Geometric Features at the Interchange Terminals with a large number of Wrong-Way Incidents: Case Studies in Alabama

Md Atiquzzaman (Tie for 2nd Place Award)

Although wrong-way driving crashes are rare, they draw a lot of attention due to their severe outcomes. Two interchange terminals were monitored by video camera for 48 hours on a typical weekend. The two locations experienced 10 and 17 WWD incidents.

Objectives

AM18 Poster Chennan Xue, Dan Xu

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A Probabilistic Model to Predict Intermittent Sight Distance Obstruction at Unsignalized Intersections on High-Speed Rural Divided Highways

Chennan Xue and Dan Xu

Minor-road left-turn vehicles’ views are likely to be blocked by major-road right-turn vehicles on the conventional right-turn lane at unsignalized intersections.

Conclusions

Extent and Impacts of the VA-DOT Exception Process for Access Management Design Standards

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The Virginia Department of Transportation (VDOT) has released a report that addresses Virginia’s standards and exemption processes for commercial entrance spacing. This report also observes the extent to which commercial access exceptions are used in Virginia, and the impact on crashes at these sites. The previous VDOT Road Design Manual details requirements that new commercial entrances meet certain minimum spacing standards, though landowners may request exemptions. 
 

NCHRP 875 Safety Impacts of Intersection Sight Distance

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NEW! NCHRP Research Report 875: Guidance for Evaluating the Safety Impacts of Intersection Sight Distance is a resource for practitioners involved in the planning, design, operations, and traffic safety management of stop-controlled intersections. It provides information on how to estimate the effect of intersection sight distance (ISD) on crash frequency at intersections and describes data collection methods and analysis steps for making safety informed decisions about ISD.

Sponsorship Opportunities

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We are happy to announce that – for the first time ever – sponsorship of the National Access Management Conference is available. These sponsorships help support the work of this committee to spread the word about how access management improves our transportation system by saving lives and improving mobility.

Quite a variety and levels of sponsorship are available, as indicated in the sponsorship form.  

You can help support the National Access Management Conference as a

Cross Streets at Freeway Interchanges: Access Management and Geometric Design Issues

  • Posted on: Wed, 01/17/2018 - 10:48
  • By: fbroen
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Workshop 177 - 2018 TRB Annual Meeting

Cross Streets at Freeway Interchanges: Access Management and Geometric Design Issues

Sunday 1:30 PM- 4:30 PM 
Convention Center, 102B

Workshop

Stuart Samberg, Rummel, Klepper, and Kahl, LLP (RK&K), presiding

Sponsored by:

Standing Committee on Access Management (AHB70)
Standing Committee on Operational Effects of Geometrics (AHB65)

Research Portal

Research Portal

An important function of TRB is to stimulate research that addresses concerns, issues, or problems facing the transportation community. To this end, AHB70 is tasked with developing a research agenda and disseminating research results that relate to access management. This research portal has been created to post up-to-date information relating to AHB70’s research activities. 

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.

FDOT Trip Generation Recommendations

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FDOT has the responsibility of maintaining the State’s roadway system. As a result, it is FDOT’s responsibility to monitor the traffic impacts of new development along the State Highway System. In response to the ever changing economic climate following the downturn of the economy, FDOT saw the need to assess the validity and applicability of trip generation and internal capture practices in Florida.

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.

Mike on Traffic's Top Site Impact Checklists

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Mike on Traffic provides proven practioners tips to help professionals.

These checklists may be useful:

  • Traffic Data Collection
  • Document Existing Conditions
  • Assumptions to Reviewers
  • Prepare Traffic Forecasts
  • Perform Capacity Analysis
  • Determine Necessary Improvements
  • Determine Whether to Use Simulation
  • Site Review
  • Prepare Documentation
  • Preparing the Proposal
  • Manage the Traffic Study
  • Agency Review

Model Land Development and Subdivision Regulations that Support Access Management

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 Effective local access management requires planning as well as regulatory solutions. Communities should establish a policy framework that supports access management in the local comprehensive plan, prepare corridor or access management plans for specific problem areas, and encourage good site planning techniques. Land development and subdivision regulations should be amended accordingly and communities may also consider a separate access management ordinance.

FDOT 2017 Complete Streets Handbook

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The Florida Department of Transportation (FDOT) Complete Streets Handbook and new FDOT Design Manual will help us provide more context-sensitive roads by putting "the right street in the right place."   This draft document is under review until July 31, 2017

FDOT Complete Streets Policy Adopted September 17, 2014

Executive Summary

FDOT District 1 Driveway Connection Handbook

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This Handbook was prepared by FDOT District 1 

The Handbook is designed to generally follow the chronological order of process needed through the pre-application, application review, permit approval, and driveway construction processes.  

Chapters

CH1 Introduction

CH2 Pre-Application Procedures

CH3 Permit Submittal Requirements

CH4 Completeness & Technical Reviews

CH5 Notice of Intent

CH6 Permit Approval and Issuance

CH7 Construction Requirements

CH8 Violations

FDOT 2016 Rules and Statutes

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State of Florida Rules and Statutes about Access Management (2016)

  • Rule 14-96 Connection Permits
  • Application and permit forms
  • Rule 14-97 Access Management Standards and Classifications
  • Access Management Florida Statute 335.18, State Highway System
  • Access Management Act
  • Procedure on Median Openings and Access Management 625-010-021
  • Procedure on Assignment of Access Management Classifications to the State Highway System

FDOT Guide to the Perplexed

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This is a PowerPoint presentation delivered to the Florida Department of Transportation District 3 Office on October 20, 2016

It covered:

  • Fundamentals of Access Management
  • Complete Streets Initiative Considerations
  • Pedestrian Access Management
  • Access Management in Site Development
  • FDOT Resources
  • Traffic Studies for Permitting
  • Exclusive Turn Lanes
  • Complete Streets Implementation
  • D3 Permit Checklist

Case Studies include:

TRB 5th International Conference on Roundabouts

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TRB sponsored the 5th International Conference on Roundabouts which took place on May 8-10, 2017, in Green Bay, Wisconsin. The conference focused on research, design, operation, safety, evaluation, and practical experience with the increasingly used roundabout form of an intersection. Visit the proceedings website to view the presentations,  final program.

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