Enhancing Safety Data to Improve AASHTO Policy
Roadmap developed by Texas A&M Transportation Institute outlines utilizing SHRP2 safety data to enhance key AASHTO documents. The project involved literature review, SME interviews, and trends in research topics related to roadway safety. Identified challenges include data access, sample size limitations, and cost constraints.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
Development of a Roadmap for Use of SHRP2 Safety Data to Enhance Existing Publications NCHRP PROJECT NO. 20-07 Task 368 Karen Dixon, Susan Chrysler, Bahar Dadashova, Darren Torbic, and Yugesh Kotpati Naidu Texas A&M Transportation Institute March 2021 1
Objective Establish a research roadmap for future projects to make use of these data to inform future editions of key AASHTO policy and guidance documents.
List of Documents Considered AASHTO Non-AASHTO Highway Safety Manual (HSM) Manual on Uniform Traffic Control Devices A Policy on Geometric Design of Highways and Streets ( The Green Book ) Highway Capacity Manual Roadside Design Guide (RDG) Human Factors Guide Guidelines for Geometric Design of Low-Volume Local Roads Traffic Engineering Handbook Roadway Lighting Design Guide Freeway Management and Operations Handbook Guide for the Development of Bicycle Facilities Guide for the Planning, Design, and Operation of Pedestrian Facilities Manual for Assessing Safety Hardware (MASH) Guide for High-Occupancy Vehicle (HOV) Facilities
Literature Review Reviewed published research that used SHRP2 Naturalistic Driving Data in these areas: Roadway Design Characteristics Intersections and Interchanges Roadside Design Characteristics Operational Factors Work Zones Environmental Factors Behavioral and Demographic Factors Medical Conditions Automated Driver Assistance Systems (ADAS)
Subject Matter Expert Interviews 17 SMEs interviewed Selected based on expertise with document Interviews touched on: Use of research as it related to each documents (AASHTO and others) Challenges and strengths of working with SHRP2 data Research needs for future research to enhance the documents
Common Themes from Interviewees Challenges in working with SHRP2 NDS Difficult to work with data you did not collect Small sample size, especially for crashes and near-crash events Cost of access in time and money Vehicle mix and lack of heavy vehicles limits use for setting many design standards where heavy vehicles are controls Dataset is aging, may be obsolete soon Age of associated crash data Fleet turnover, new vehicle safety systems
Common Themes from Interviewees Strengths in working with SHRP2 NDS Geographic diversity High quality of RID data Larger sample size for kinematic data Real non-event driving Potential for future before/after studies combining SHRP2 (before) with new data collection (after)
Take Away Note from Interviews: Despite the challenges, most interviewees saw value in the SHRP2 dataset, especially in the normal, uneventful driving periods.
Identify Research Needs The project team identified the top 22 suggestions for future research based on the literature review and interviews. The project team, in consultation with the project panel, prioritized 7 key research needs and developed Research Needs Statements for each These Research Needs Statements can be used by AAHSTO committees and other interested parties to guide future research direction using the SHRP2 NDS
Research Needs Statements Developed Problem Statement Number 1 Document Research Problem Statement Title AASHTO Green Book Updated Acceleration and Deceleration Rates for Geometric Design 2 AASHTO RDG Encroachment Data for Roadside Design Guide 3 AASHTO HSM Incorporating Motor Vehicle Speed into Safety Performance Functions 4 Lighting Driver Behavior in Daytime and Nighttime Conditions 5 AASHTO Green Book Evaluation of Driver Behavior on Approaches to Uncontrolled and Yield- Controlled Intersections Assessment of Common Superelevation Rates Applied to Modern Motor Vehicles and Road Surfaces Influence of Driveway and Intersection Density on Access Management Safety Development of CMFs 6 AASHTO Green Book 7 AASHTO HSM
Enhancing Usability of Data In addition to research needs, the project team identified several actions that would improve usability of the SHRP2 NDS Data: Catalog of available data in normal driving dataset; what is coded, what is not Catalog of available reduced datasets Catalog of available coding of pedestrian and bicycle presence or activity in forward view Publicize availability of data
