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OVERVIEW OF THE NEW HIGHWAY SAFETY MANUAL
Karen Dixon, Oregon State UniversityNCHRP 17-38 Project Member
AASHTO Subcommittee onSafety Management
September 4,2009Savannah, GA
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
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
CR
AS
H R
ISK
DESIGN DIMENSIONLane Width, Radius of Curve, Stopping Sight Distance, etc.
CR
AS
H R
ISK
DESIGN DIMENSIONLane Width, Radius of Curve, Stopping Sight Distance, etc.
UNLIKE NOMINAL SAFETY, SUBSTANTIVE SAFETY IS A CONTINUUM
Substantive Safety Nominal Safety
NOMINAL SAFETY VS SUBSTANTIVE SAFETY
CR
AS
H R
ISK
DESIGN DIMENSIONLane Width, Radius of Curve, Stopping Sight Distance, etc.
Low NominalLow Substantive
Low NominalLow Substantive
Low NominalHigh Substantive
Low NominalHigh Substantive
High NominalLow Substantive
High NominalLow Substantive
High NominalHigh Substantive
High NominalHigh Substantive
SUBSTANTIVE SAFETY MAY VARY WHEN NOMINAL SAFETY DOES NOT
Existing ConditionsExisting Conditions Alternative 1Alternative 1
Alternative 2Alternative 2 Alternative 3Alternative 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
•Construction 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
THE HSM – A TEN-YEAR RESEARCH AND DEVELOPMENT EFFORT
19991999 20002000 20032003 FutureFuture
Research, research and more research
2010201020072007
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
PART BROADWAY SAFETY MANAGEMENT PROCESS
Network
Screening
Diagnosis
Countermeasure
Selection
Economic
Appraisal
Prioritization of
Improvement
Projects
4 5 6 7 8 9
Safety
Effectiveness
Evaluation
PART CPREDICTIVE METHOD
• Methodology• Applications • Safety issues not
explicitly addressed by the methodology
• Example problems• References
Special Part C Special Part C Common ProceduresCommon Procedures
• Calibration• Combining predicted
with observed crashes
• Assess the system needs & identify projects/studies
• Program projects• Evaluate system-wide safety effects of programs
• 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
• Evaluate safety of alternative design approaches• Assist in review & documentation of design
exceptions, variances and waivers• Inform decisions on construction staging, work
approaches, etc.
• Monitor operations to maintain balance among safety, mobility and access.
• Evaluate the effectiveness of implemented improvements
TRAINING & OUTREACH ACTIVITIES
• October 2009 – Jan 2010– 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
KEY CONTACTS
• AASHTO– Ken Kobetsky: [email protected], (202) 624-5254– Jim McDonnell: [email protected], (202) 624-5448– Kelly Hardy: [email protected], (202) 624-5868
• AASHTO JOINT TASK COMMITTEE FOR THE HSM– Don Vaughn, ALDOT, [email protected],
(334) 242-6319
KEY CONTACTS• TRB/ NCHRP
– Rick Pain: [email protected], (202)334-2964– Chuck Niessner: [email protected], (202) 334-1431
• TRB HSM TF: Development of a Highway Safety Manual– John Milton, [email protected], (360)704-6363
• TRB HSM TF: User Liaison– Geni Bahar (User Liaison Subcommittee of the TRB HSM
Task Force): [email protected], (416) 932-9272• TRAINING
– Karen Dixon (PI of NCHRP Project 17-38): [email protected], (541) 737-6337