Highway Safety Manual

Part III - Chapter 8: Rural, TwoLane Roads
8.1 8.2 8.3 8.4 8.5 8.6 Introduction Methodology Applications Example Problems References Appendices
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Part III - Chapter 9: Rural, MultiLane Highways
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What does it boil down to (2)
Safety Prediction Methodology 1. Select Segment or Intersection 2. Apply Base Model 3. Apply Calibration Factor 4. Apply AMFs 5. Determine accident frequency, severity distribution, and type distribution 6. Present final predicted values
9.1 9.2 9.3 9.4 9.5 9.6 Introduction Methodology Applications Safety Issues Not Explicitly addressed by the Methodology Example Problems References
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Outline for First Edition of the HSM
Part I – Introduction and Fundamentals Part II – Knowledge Part III – Predictive Methods Part IV – Safety Management of a Roadway System Part V – Safety Evaluation Glossary
8HisΒιβλιοθήκη ory (1)Started with discussions within TRB about role of safety in Highway Capacity Manual Conference Session at TRB’s January 1999 Annual Meeting concluded: – There is an absence of and a need for a single authoritative document to use for estimating safety impacts December 1999 Workshop confirmed: – There is a crucial need for a standalone document to be named the Highway Safety Manual
THE HIGHWAY SAFETY MANUAL
AASHTO Subcommittee on Design
June 16, 2006
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Overview of Presentation
Purpose of the Highway Safety Manual Highway Safety Manual Contents Challenges Ahead
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Targeted Users of the HSM
Primarily users – Front-line decision makers: • Analysts studying the effect of actions on road users • Planners, designers, and those responsible for operations and maintenance Secondary users: • Management • Educational Institutions
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What does it boil down to (1)
Base model predicting crash frequency – Two lane rural highway
Nbr=(ADT)(L)(365)(10-6)(e-.4865)
Accident Modification Factors
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Part II - Chapter 5: Interchanges
5.1 5.2 Safety Effects of Interchange Design Elements Safety Effects of Traffic Control and Operations Elements
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Part II - Chapter 6: Special Facilities and
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Part II - Chapter 4: Intersections
4.1 4.2 4.3 4.4 Safety Effects of Intersection Design Elements Safety Effects of Intersection Traffic Control and other Operational Elements Safety Effects of other Intersection Related Features Pedestrian and Bicycle Safety at Intersections
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What is the Highway Safety Manual (HSM)?
Purpose: To provide the best factual information and tools to facilitate roadway planning, design, operations, and maintenance decisions based on consideration of safety consequences. – Synthesizes validated highway research – Adapts & integrates research for practice – Provides analytical tools for predicting impact on road safety
Geometric Situations
6.1 6.2 Railroad-Highway Grade Crossings Construction and Maintenance Work Zone Areas
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Part II - Chapter 7: Road Networks
7.1 7.2 7.3 7.4 7.5 7.6 7.7
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The ‘vision’ of the HSM -- a document similar to the HCM
Definitive; represents quantitative ‘state-ofthe-art’ information Accepted within the transportation engineering profession Science-based; updated regularly to reflect research
Nbr=(ADT)(L)(365)(10-6)(e-.4865)
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Part I - Chapter 1 Introduction and Overview
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
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Purpose Background on the Need for HSM Scope of the HSM Intended Audience Intended use of the HSM Context for the HSM: Use and Misuse of the Manual Nature of the HSM Organization of HSM
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Introduction Safety in Transportation Network Planning Safety in the Planning and Design of Residential Neighborhoods and Commercial Areas One-Way Systems and Turn Restrictions Safety in Traffic Calming Access Management Road-use Culture
Part I - Chapter 2: Fundamentals
2.1 2.2 2.3 2.4 2.5 2.6 What is Safety? How Road Safety is Measured? Effect of Traffic Volume & Vehicle Mix Safety Performance Functions and Crash Modification Factors Human Factors in Road Safety Speed and Safety
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Part II - Chapter 3: Roadway Segments
3.1 3.2 3.3 3.4 Safety Effects of Highway Design Elements Safety Effects of Traffic Control and Operational Elements Pedestrian and Bicycle Safety on Roadway Segments Safety Effects of other Elements
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HSM Development – Current Research Efforts
– NCHRP 17-18(4) – Table of Contents, Work Plan, and Safety Performance Models for Two Lane Rural Highways – NCHRP Project 17-26 – Safety Performance Models for Urban and Suburban Arterials – NCHRP 17-27 - Parts I and II of the HSM – NCHRP 17-29 - Safety Prediction Models for Rural Multilane Highways – NCHRP 17-34 – Parts IV and V of the HSM – NCHRP 17-36 – HSM Production Contract