AASHTO Safety Data Systems Task Group

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AASHTOSafety Data Systems Task Group

• Tom Welch, PE
• State Traffic Safety Engineer
• Iowa Dept. of Trans., Traffic and Safety
• Tom.Welch_at_dot.iowa.gov

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AASHTOStanding Committee on Highway Traffic
SafetySubcommittee on Safety ManagementTask
Groups
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Task Groups

• Technical Information and Resources
• At Risk Roadway Users
• Strategic Highway Safety Plans
• Safety Data Systems Analysis
• Safety Information Packages
• Research

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IV Safety Data Systems Analysis

• Tom Welch - IA (Chair)
• Kevin Lacy NC (Vice Chair)
• Mike Staggs FHWA Liaison
• Rick Pain TRB

• Chuck Reider NV
• Sean Hiraoka HI
• Dale Lighthizer MI
• Brett Harrelson SC
• Douglas Bish OR
• Michael Curtit MO
• Vernon Betkey MD
• Jim Willis MS
• David Beach UT
• Dan Magri LA
• Marsha Ways WV
• Michael Sandoval NM
• Jennifer Townley OH
• Cindy Cashen AK
• Brad Foley ME
• Michael Pawlovich - IA

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IV Safety Data Systems Analysis

• To support and enhance all safety management
  support systems, the assessment of common needs,
  definition of requirements, and
  development/implementation of new solutions
  through the AASHTOWare Program, if appropriate.
• Develop/distribute crash reduction factors and
  safety training manuals, identify successful
  countermeasures, and develop accurate and current
  traffic records systems. These efforts will help
  support the implementation of states SHSPs.

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Background Material

• SAFETEA-LU allocated 1M (after reductions) to
  AASHTO to develop a successor to the TSIMS
  project (needs match)
• AASHTO and AASHTOWare were not making a software
  proposal
• Asking Task Group to consider how AASHTO might
  serve the membership

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Task Force Response

• No Interest in TSIMS-like data management and
  analysis tools
• Most states have data repository
• Not feasible or prudent as each state has unique
  existing systems
• Very difficult to gain consensus on data analysis
  tools

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Summary of Task ForceDiscussion and Action

• Design for basic data model/database
  infrastructure
• GIS-based analysis tool for local agencies
• CRFs website
• Workforce development and training
• Synthesis of practice for officer training and
  crash reporting
• Data collection synthesis of best practice

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State DOT Data Gap Needs

• Local road crash data
• Locating crashes
• Data quality/edit processes
• Macro/Annual QC
• Micro/case-by-case

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Data Collection Synthesis

• Location referencing (GPS vs. linear referencing)
• Data validation at the point of entry and/vs
  during post-processing of data
• Preferred form factor of the electronic data
  gathering device
• Web applications and/vs PC applications

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Data Collection Synthesis

• Wireless applications
• Data for data between agencies
• Data linkages (spatial and/or attribute/key
  field)
• Local law enforcement data uses
• Central crash data repository access/provision
  for distribution/dissemination

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GIS-based analysis toolfor local agencies

• Simple, basic tool
• GIS-based
• Simple, straightforward linkage to existing state
  data formats
• Availability throughout a variety of user levels
• Consideration of expandability

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Training Needs

• New TRB Task Force on Road Safety Workforce
  Development
• AASHTO Task Group Input
• Safety Engineering courses
• Local agencies
• National 2-3 week new safety engineers course

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FHWA Crash Reduction Factors (CRF) Field Guide

• PURPOSE
• The purpose of this task is to compile a set of
  accident modification factors (AMFs) for safety
  and traffic engineering practitioners. There is
  also a request for crash reduction factors (CRFs)
  to be added to the list.

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CRF Field Guide

• Step 1. Create a List of Treatments or
  Countermeasures
• The iTRANS/VHB team will create a list of
  treatments grouped by the crash types of
  intersection, roadway departure, and pedestrian.

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CRF Field Guide

• Step 2. Gather Sources for Accident Modification
  Factors
• The Highway Safety Manual (HSM) as part of NCHRP
  Project 17-27 collected and reviewed over 600
  publications, which will are available to the
  iTRANS/VHB team.
• Some of the additional publications already
  proposed to the Team will include
• Research Results Digest (RRD) 299 Crash
  Reduction Factors for Traffic Engineering and
  Intelligent Transportation System (ITS)
  Improvements State-of-Knowledge Report
• Kentucky Transportation Cabinet Report KTC-96-13
  Development of Accident Reduction Factors
• Engineering Countermeasures to Reduce Red-Light
  Running, FHWA/TX-03/4027-2, August 2002, TTI
• Hovey, P.W. Chowdhury, M. "Development of Crash
  Reduction Factors" Prepared for Ohio DOT,
  September 2005
• Bonneson, J. Zimmerman, K. Fitzpatrick, K.
  "Roadway Safety Design Synthesis" Texas
  Transportation Institute for Texas DOT, November
  2005

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CRF Field Guide

• In order to have the latest and most complete
  list of AMFs, the iTRANS/VHB Team will coordinate
  with the following NCHRP projects to request for
  relevant interim materials.
• NCHRP Project 17-26, Methodology to Predict the
  Safety Performance of Urban and Suburban
  Arterials (HSM Part III, Chapter 9).
• NCHRP Project 17-29, Methodology to Predict the
  Safety Performance of Rural Multilane Highways
  (HSM Part III, Chapter 10).
• The TRB HSM Task Force is revisiting the SPFs and
  AMFs developed by Harwood et al. for IHSDM (2000)
  for rural two-lane roads (HSM Part III, Chapter
  8).
• NCHRP 17-35 Evaluation of Safety Treatments at
  Signalized Intersections.

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CRF Field Guide

• AMF Selection Guidance
• Only AMFs which are both precise and accurate
  should be included in the published deliverables.
  The NCHRP 17-27 project has developed a decision
  rule in order to determine the acceptability of
  AMFs for inclusion in the first edition of the
  HSM.

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CRF Field Guide

• DELIVERABLES
• The following deliverables will be developed as
  part of this task
• Updated text for joint FHWA/ITE Publication
  Intersection Safety Issue Brief Number 5 Traffic
  Signals in a camera-ready format.
• Updated text for joint FHWA/ITE Publication
  Intersection Safety Issue Brief Number 8 Toolbox
  of Countermeasures and Their Potential
  Effectiveness to Make Intersections Safer in a
  camera-ready format.
• Field Guides with AMFs (and CRFs) for treatments
  divided in terms of crash types, i.e., roadway
  departure, intersection, and pedestrian in a
  camera-ready format.

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CRF Field Guide

• DELIVERABLES
• Scanned AMF reference materials in an electronic
  version (CD or DVD).
• A 45-minute PowerPoint presentation describing
  the project and findings complete with speaker
  notes
• New text for a Roadway and Lane Departure Safety
  Issue Brief in a camera-ready format.
• New text for a Pedestrian Safety Issue Brief in a
  camera-ready format.

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CRF Field Guide

• SCHEDULE
• It is expected that the work will commence in
  January 2007 and be completed by Mid-July 2007.
• CONTACT
• Clayton Chen, FHWA

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Next Steps

• Submit Synthesis of Practice on Data Collection
• Submit GIS-based Analysis Tool AASHTOWare
  Proposal
• Complete FHWA CRF Field Guide