OVERVIEW OF THE NEW HIGHWAY SAFETY MANUAL
Tim Neuman, CH2M HillNCHRP 17-38 Project Member
2009 Strategic Highway Safety Plan Peer ExchangeSCOHTS Annual Meeting
May 1, 2009 Chicago, Illinois
Presentation Summary
What is the HSM?
Why is the HSM needed?
How can the HSM be used?
When will the 1st Edition be available?
Where can one find more information about the HSM?
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I. WHAT IS THE HSM?Overview of the new HSM
WHAT IS THE HSM?
Provide
Best factual information
To facilitate explicit safety considerations for:
Planning
through
Synthesis of validated highway research
THE VISION OF THE HSM - A DOCUMENT AKIN TO THE HCM
Definitive; represents quantitative ‘state-of-the-art’
information
Widely accepted within professional practice of
transportation engineering
Science-based; updated regularly to reflect research
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WHAT THE HSM IS NOT
• The HSM does not set requirements or mandates• The HSM is not a best practice document for design or
operations.• The HSM contains no warrants or standards
and does not supersede other publications that do.
vs
The HSM does not establish a legal
standard of care nor does it create a duty
to the public.
II. WHY DO WE NEED THE HSM?Overview of the new HSM
IS THIS ROAD “SAFE” OR “UNSAFE”?
What does safety really mean?
Nominal SafetySubstantive Safety
Examined in reference to compliance with standards, warrants, guidelines and sanctioned design procedures
The expected or actual crash frequency and
severity for a highway or roadway
HIGHWAY SAFETY HAS TWO DIMENSIONS
*Ezra Hauer, ITE Traffic Safety Toolbox Introduction, 1999
UNLIKE NOMINAL SAFETY, SUBSTANTIVE SAFETY IS A
CONTINUUM
SUBSTANTIVE SAFETY MAY VARY WHEN NOMINAL SAFETY DOES NOT
Existing Conditions Alternative 1
Alternative 2 Alternative 3
WE’RE INTERESTED IN OTHER IMPACTS FOR PROJECT LEVEL DECISIONS – WHAT ABOUT
SUBSTANTIVE SAFETY?
Safety Environmental Traffic Right-of-Way Costs Impacts Impacts Operations
• Traffic Noise Model 1.0
• CAL3QHC• Mobile 5a• 3-D Visualization• CITYGREEN
• HCM• CORSIM• PASSER• TRANSYT7F• VISSIM
• GEOPAK Plans
• Cost Models• Real estate
appraisals• DOT databases
Design Criteria (nominal
safety)
Mor
e qu
antit
ativ
e
Gre
ater
wei
ght
The HSM
THE HSM CONTAINS BEST SCIENCE &
RESEARCH
• Synthesis of previous research
• New research commissioned by AASHTO and FHWA
III. HOW WAS THE HSM DEVELOPED?
Overview of the new HSM
THE HSM – A TEN-YEAR RESEARCH AND DEVELOPMENT EFFORT
Absence & need to estimate
safety impactsTRB
December Workshop
Members of sponsoring committees
AASHTO, FHWA, ITE
TRB Task Force for
the Develop-ment of a
HSM
AASHTO HSM TF
1st Edition(projected)
1999 2000 2003 Future
Research, research and more research
20102007
SIGNIFICANT EFFORT & PROFESSIONAL SUPPORT PRODUCED
THE HSM• Joint
Subcommittee sponsored by 7 TRB committees
• Thousands of hours of volunteer effort
• Research program funded by NCHRP, AASHTO & FHWA
NCHRP Project 17-18(04)
•Development of a HSM - Draft Table of Contents for the HSM.
NCHRP Project 17-25
•Crash Reduction Factors for Traffic Engineering and ITS Improvements
NCHRP Project 17-26
•Development of Models for Prediction of Expected Safety Performance for Urban and Suburban Arterials
NCHRP Project 17-27
•Prepare Parts I and II of the HSM
NCHRP Project 17-29
•Safety Prediction Models for Rural Multilane Highways for Use in the HSM
NCHRP Project 17-34 (4) and (5)
•Prepare Parts IV and V of the HSM
NCHRP Project 17-36
•Production of the First Edition of the HSM
NCHRP Project 17-37
•Pedestrian Predictive Crash Methodology for Urban and Suburban Arterials
NCHRP Project 17-38
•HSM Implementation and Training Materials
RESEARCH PATH TO THE HSM V.1
IV. WHAT IS COVERED BY THE HSM?Overview of the new HSM
OUTLINE OF THE HSM
Part A Introduction,
Human Factors, and
Fundamentals
Part B Roadway Safety
Management Process
Part C Predictive Method
Part D Accident Modification
Factors
PART AINTRODUCTION, HUMAN FACTORS, & FUNDAMENTALS
•Introduction and OverviewChapter 1
•Human FactorsChapter 2
•FundamentalsChapter 3
PART BROADWAY SAFETY MANAGEMENT PROCESS
4 6 8
Network
Screening
Diagnosis
Countermeasure
Selection
Economic
Appraisal
Prioritization of
Improvement
Projects
4 5 6 7 8 9
Safety
Effectiveness
Evaluation
PART CPREDICTIVE METHOD
Two-Lane Rural Roads
Urban/ Suburban Arterial Highways
Rural Multilane Highways
• Methodology• Applications • Safety issues not
explicitly addressed by the methodology
• Example problems• References
Special Part C Common Procedures
• Calibration• Combining predicted
with observed crashes
PART DACCIDENT MODIFICATION FACTORS
•Roadway SegmentsCHAPTER 13
•IntersectionsCHAPTER 14
•InterchangesCHAPTER 15
•Special facilities and Geometric SituationsCHAPTER 16
•Road NetworksCHAPTER 17
V. WHO SHOULD USE THE HSM? Overview of the new HSM
WHO SHOULD USE THE HSM?
System Planning
Project Planning
Preliminary Design, Final
Design, & Construction
Operations & Maintenance
• Assess the system needs & identify projects/studies
• Program projects• Evaluate system-wide safety effects of
programs
System Planning Project Planning
Preliminary Design, Final Design, and
Construction
Operations and Maintenance
• Define problem(s) and assist in scoping• Identify potential solutions• Assess or evaluate multiple alternatives and
expected quantitative safety effects • Aid in identification of a preferred alternative
System Planning
Project Planning
Preliminary Design, Final Design, and
Construction
Operations and Maintenance
• Evaluate safety of alternative design approaches• Assist in review & documentation of design
exceptions, variances and waivers• Inform decisions on construction staging, work
approaches, etc.
System Planning Project Planning
Preliminary Design, Final Design, and
Construction
Operations and Maintenance
• Monitor operations to maintain balance among safety, mobility and access.
• Evaluate the effectiveness of implemented improvements
System Planning Project Planning
Preliminary Design, Final Design, and
Construction
Operations &
Maintenance
VI. WHEN WILL THE HSM BE AVAILABLE?
Overview of the new HSM
IMPLEMENTATION SCHEDULENow
through July 31, 2009: Review
& ballotin
g by SCOTE, SCOHTS
and SCOD
Sept 1st to 30th, 2009
–
Ballot by
SCOH
Expected Release
Date:
Early 2010
COMPANION SOFTWARE
HSM Part Supporting Tool
PART B: Roadway Safety Management Process
SafetyAnalysthttp://www.safetyanalyst.org/
PART C: Predictive Methods IHSDM
PART D: Accident Modification Factors
FHWA CRF/AMF Clearinghouse
TRAINING & OUTREACH ACTIVITIES
• Sept – Nov 2009– Conduct two or three multi-state pilot courses
• August 2009– TRB Task Force Meeting
• TRB 2010 Annual Meeting– One-day workshop
• Training materials, including “Train-the-trainer” available upon HSM release
VII. WHERE CAN ONE FIND MORE ABOUT THE HSM?
Overview of the new HSM
http://www.highwaysafetymanual.org
DATA NEEDS GUIDEhttp://www.highwaysafetymanual.org
KEY CONTACTS• AASHTO
– Ken Kobetsky: [email protected], (202) 624-5254– Jim McDonnell: [email protected], (202) 624-5448
• IMPLEMENTATION– Geni Bahar (User Liaison Subcommittee of the TRB
HSM Task Force): [email protected], (416) 932-9272
• TRAINING– Karen Dixon (PI of NCHRP 17-38):
[email protected], (541) 737-6337
THE END
Questions?