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Highway Safety Improvement Program

Highway Safety Improvement Program. Basic Components. HSIP Basic Phases. Planning and analysis What should we do? Implementation Do it. Evaluation Was it successful?. Planning and analysis. Collect and Maintain data Identify hazardous locations to prioritize needs

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Highway Safety Improvement Program

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  1. Highway Safety Improvement Program Basic Components

  2. HSIP Basic Phases Planning and analysis What should we do? Implementation Do it. Evaluation Was it successful?

  3. Planning and analysis • Collect and Maintain data • Identify hazardous locations to prioritize needs • Conduct engineering studies 4) Establish project priorities

  4. Planning and analysis 1. Collect and Maintain data a) Establish Location System … where are the crashes? • Milepost • Reference point • Link-node • Coordinates (GIS)

  5. Planning and analysis • Collect and Maintain data b) Types of data Crash data Forms and databases Spot maps Collision diagrams Traffic data Volumes, time of day Classification Highway system • road types - classification • pavement type and condition • geometric conditions • photologs, etc.

  6. Planning and analysis 2) Identify hazardous locations to prioritize needs Techniques to consider … • accident frequency • accident rate • accident severity • rate-quality control • hazard index • EB ...

  7. Planning and analysis • Conduct engineering studies a) Conduct studies to identify contributing causes • speed studies • lane occupancy • sight distance • skid resistance • lighting • traffic control devices • school crossing studies • environment, etc.

  8. Planning and analysis • Conduct engineering studies b) Develop Countermeasures • Evaluate cause-effect relationships • Consider accident patterns c) evaluate cost- effectiveness • Crash costs • National Safety Council • NHTSA • DOT, others • Crash reduction factors (CRF) or Accident Modification Factors (AMF or ARF) • Many sources (with large variations) • Cost effectiveness, B/C, ROR (rate of return), TOR (time of return), NB (net benefit), …

  9. Planning and analysis 4) Establish project priorities Strategies • ranking • Incremental benefit-cost, • programming

  10. Implementation Initiate the selected programs • GANTT charts • PERT • CPM • MSS/DSS

  11. Evaluation a)determine the effect of safety improvements (crashes) Experimental plan • Before and after study at treatment sites • Before and after study with control sites • Comparative, parallel study • Bayesian probability statistics, • etc.

  12. Evaluation b) perform non-accident evaluation • changes in speed • changes in conflicts • other c) review administrative performance • timely process? • within budget?

  13. Highway Safety Improvement Program

  14. Federal (FHWA) Highway Safety Improvement Program • Core program of SAFETEA-LU • Separately funded (Section 148) • Requires Strategic Highway Safety Plan (SHSP) • ID and analyze problems/opportunities • ID projects and strategies • Evaluate accuracy of data • Prioritize improvements • Hazard Elimination Safety (HES) program • section 152 • High Risk Rural Roads (HRRR) program • Rail-Highway Grade Crossing program • Section 130

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