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NC Local Safety Partnership

Learn the essential components of collision diagram preparation and how to detect treatable crash patterns using before and after diagrams. Understand how collision diagrams serve as a fundamental tool for analyzing crash activity, illuminating patterns, and outlining statistical data in various intersection and non-intersection scenarios. Explore methods like manual, CADD, and commercial tools for diagram preparation, including examples of 4-leg, T, Y, and roundabout intersections. Discover how before/after diagrams visually demonstrate treatment effects on crash patterns.

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NC Local Safety Partnership

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Presentation Transcript

  1. NC Local Safety Partnership Preparing Collision Diagrams

  2. Module Objectives Understand the fundamental components of collision diagram preparation Use collision diagrams to identify and detect treatable crash patterns

  3. Collision Diagrams Fundamental tool for depicting and analyzing crash activity at a location Illuminates crash patterns Outlines statistical data

  4. Before & After Collision Diagram AFTER BEFORE

  5. Exploring the Collision Diagram

  6. Diagram Area

  7. Symbols

  8. ID Information

  9. Statistical Information

  10. Collision Diagram Preparation Diagram not to scale Usually little or no topographic data Officer’s sketch & narrative main source Place time and date on vector judged most causative

  11. Methods of Preparation Manual CADD Commercial

  12. After Diagrams AFTER 54 Months BEFORE 54 Months

  13. Module 4 – Collision Diagrams examples

  14. 4 Leg Intersection

  15. T Intersection

  16. Y Intersection

  17. Roundabout

  18. Non-Intersection

  19. Take Away Messages A variety of methods/technologies are available for collision diagram preparation Crash patterns can be detected by reviewing collision diagrams for a variety of intersection types and non-intersection locations Before/after diagrams provide visual indication of treatment’s effect

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