ROADSIDE DESIGN GUIDE, 4 th Edition 2011 AASHTO - Subcommittee on - - PowerPoint PPT Presentation

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ROADSIDE DESIGN GUIDE, 4 th Edition 2011 AASHTO - Subcommittee on - - PowerPoint PPT Presentation

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Keith A. Cota, New Hampshire Department of Transportation ROADSIDE DESIGN GUIDE, 4 th Edition 2011 AASHTO - Subcommittee on Design June 11, 2012 Portland, Maine 1 ROADSIDE DESIGN GUIDE, 2011 2 Presentation Overview 2011 RDG Update

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ROADSIDE DESIGN GUIDE, 4 th Edition 2011

AASHTO - Subcommittee on Design June 11, 2012 Portland, Maine

Keith A. Cota, New Hampshire Department of Transportation

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ROADSIDE DESIGN GUIDE, 2011

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Presentation Overview

  • 2011 RDG Update Objectives
  • Summary of Some Notable

Chapter Changes

  • TCRS Research Objectives

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ROADSIDE DESIGN GUIDE, 2011 UPDATE OBJECTIVES

  • UPDATE STATISTICS
  • INCORPORATE LASTEST RESEARCH
  • RESOLVE CONFLICTS RELATED TO

CLEAR ZONE [NCHRP 20-7 (TASK 171)] WITHIN AASHTO DOCUMENTS”

  • REFERENCE AASHTO-AGC-ARTBA,

TASK FORCE 13 WEB SITE FOR STANDARDIZED HIGHWAY BARRIER HARDWARE

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ROADSIDE DESIGN GUIDE , 2011 CONFLICT ADJUSTMENTS

ESTABLISHED DEFINITION FOR USE ON BOTH PUBLICATIONS FOR :

  • Clear zone
  • Clear Recovery Area
  • Horizontal Clearance
  • Lateral Offset

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ROADSIDE DESIGN GUIDE, 2011 UPDATE

  • APPENDIX WITH STANDARD

DRAWINGS REMOVED

  • REFERENCE AASHTO-AGC-ARTBA

TASK FORCE 13 REPORT,“A GUIDE TO STANDARDIZED HIGHWAY BARRIER HARDWARE”

  • WEB SITE – http:aashtotf13.org.

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ROADSIDE DESIGN GUIDE, 2011

  • REFERENCE FHWA – OFFICE OF

SAFETY FOR ACCEPTANCE LETTERS

  • WEB SITE –

http://safety.fhwa.dot.gov/roadway_dept/road_hardware/index.htm

  • ADD REFERENCE FOR UPDATE

CRASH TEST CRITERIA UNDER MASH & FHWA/AASHTO IMPLIMENTATION PLAN

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ROADSIDE DESIGN GUIDE, 2011

SUMMARY OF CHAPTER CHANGES

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 1 - Introduction

  • Update Statistical Data
  • Reference New Crash Test

Procedures for Manual For Assessing Safety Hardware, 2009

  • Reference to AASHTO/FHWA Joint

Implementation Plan For Continued Use of NCHRP 350 Accepted Hardware

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 2 – Economic Evaluation

  • Development of Update Benefit/Cost

Analysis Program (RSAP) Beta Program in Testing Mode – Anticipated Availability 2012

  • Reference New Crash Test Procedures

for Manual For Assessing Safety Hardware, 2009

  • Added Section 2.3 In-Service Evaluation

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 3 – Roadside Topography

  • Update Definition on Clear Zone –

includes shoulders, bike lanes, and auxiliary lanes

  • Horizontal Curve Adjustment

Factors (Table 3-1)

  • Expanded Examples for Clear Zone

Evaluation

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 4 – Sign, Signal, Trees, Poles

  • Broader Guidance for Protection of

High Level Lighting Support (Section 4.5.2)

  • Expanded Discussion on Utility

Pole Site Awareness (Section 4.8)

  • Expanded Tree Discussion on

Treatment Approaches (Section 4.9)

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 5 – Roadside Barriers

  • Reference to MASH Acceptance for

Roadside Hardware

  • Reference to Task Force 13 Web Site for

Barrier Information

  • New Table 5-4 for Listing of Roadside

Barrier Hardware

  • Strong Post W-Beam – Minimum Height
  • f 26½ inches (replace at lower heights)

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 5 – Roadside Barriers

  • Update and Added New Roadside 31 in. Tall Hardware

Systems (MGS, Gregory Mini Spacers, Trinity T -31, Nu-Guard , etc)

  • Added Reference to Zone of Intrusion
  • Enhanced Guidance for Placement of Curbs with

Barrier Hardware

  • Revision to Length of Need for Design Speed Ranges,

ADT Ranges, and Runout Lengths

  • New Section for Guidance for Addressing Guardrail on

Radius

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 6 – Median Barriers

  • New Table 6.4.1 Listing of Crashworthy

Median Barriers

  • Update Summary of Median Barriers
  • Introduces Zone of Intrusion
  • Revision to Length of Need for Design Speed

Ranges, ADT Ranges, and Runout Lengths

  • New Section for Guidance for Addressing

Guardrail on Radius

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 7 – Bridge Railings

  • General Updates
  • Reference for Complete Listing of Bridge

Railings to Task Force 13 Web Site

  • Reference to AASHTO –LRFD Bridge Design

Specifications

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 8 – End Treatments

  • Rewrote Chapter with References to

Anchorages, Terminals, and Crash Cushions

  • Reference for Complete Listing of End

Treatment Systems to Task Force 13 Web Site

  • Discussion on Energy-Absorbing vs. Non-

Energy-Absorbing

  • Update of Terminals and Crash Cushions for

Roadside and Median Applications

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 9 – Work Zones

  • Application for Clear Zone Concept in Work

Zones

  • New Section 9.2.1.1 on Test Level

Requirement for PCB’s and Replacement of Damages Systems

  • Crashworthy Truck-Mounted Attenuators

(TMA) and Trailer-Mounted Attenuators

  • New Reference to Pavement Edge Drop-Offs

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 10 – Urban

  • Updated Chapter Based Upon NCHRP Report

612 (2008)

  • New Definition for Minimum Lateral Offset
  • Targeted Design Approach for High Risk

Urban Corridors

  • Recommended Lateral Offset to Obstructions

(12 ft with minimum of 6 ft from face of curb)

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URBAN CHAPTER 10 Recognizes that Urban ROW are often extremely restricted, limiting the applicability of clear-zone practice – even in suburban to urban transitions.

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URBAN CHAPTER 10 Landscape Buffer (Planting Strip) Configuration

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 11 – Mailbox

  • Suggested Lateral Offsets for Placement
  • f Mailboxes
  • Update on Mailbox Support and

Attachments

  • Considerations in Formulating Model

Mailbox Regulations

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ROADSIDE DESIGN GUIDE, 2011 CHAPTER 12 – Low Volume Roadw ays

  • Low Volume Roadways – 400 ADT or

less

  • Encourages clear zone application

where practical

  • Defines strategies to be considered:

signage, pavement markings, traversable slopes, breakaway hardware

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ROADSIDE DESIGN GUIDE UPDATE OBJECTIVES

  • ADD NEW CHAPTER FOR LOW

VOLUME ROADS

  • Guidance on clear zone, drainage

placement, slope and ditch cross- sections, barriers (TL2), sign supports, utility poles placement, etc.

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AASHTO - ROADSIDE DESIGN GUIDE

ONGOING RESEARCH NEEDS

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AASHTO - ROADSIDE DESIGN GUIDE

ONGOING RESEARCH NEEDS

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AASHTO - ROADSIDE DESIGN GUIDE RESEARCH NEEDS

  • Long-Term Data Collection System
  • Re-evaluation of Length of Need
  • Roadside Barrier Placement on

Slopes (Cable Median Applications)

  • Development of Clear Zone Recovery

Guidelines

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AASHTO - ROADSIDE DESIGN GUIDE RESEARCH NEEDS

  • Warranting Criteria for Roadside

Barriers for Various Crash Test Levels

  • Sign Post Impacts under MASH
  • Work Zone Safety
  • Motorcycle Crashworthy

Considerations and Guidelines

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AASHTO – TCRS RESEARCH INTIATIVES

AASHTO – TCRS JOINT MEETING WITH TRB COMMITTEE AFB20 Date: July 29 to August 2, 2012 Location: TRB Center at Irvine, California Objective - Strategic Directions on Roadway Departure Crashes: Supporting a Decade of Action

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CONTACT INFORMATION KEITH A.COTA NEW HAMPSHIRE DOT PHONE – 603-271-1615 EMAIL: kcota@dot.state.nh.us

AASHTO – TECHNICAL COMMITTEE ON ROADSIDE SAFETY

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AASHTO - TCRS

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QUESTIONS