1 / 22

Combining Crash and Enforcement Location Data to Determine Selective Enforcement Strategies

Combining Crash and Enforcement Location Data to Determine Selective Enforcement Strategies. 4 th Annual GIS Symposium - Troy November 16, 2007. Outline. Data sources Starting point Mapping crashes (points, lines, regions) ECitation Mapping citations (points, lines, regions)

dianne
Download Presentation

Combining Crash and Enforcement Location Data to Determine Selective Enforcement Strategies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Combining Crash and EnforcementLocation Data to Determine Selective Enforcement Strategies 4th Annual GIS Symposium - Troy November 16, 2007

  2. Outline • Data sources • Starting point • Mapping crashes (points, lines, regions) • ECitation • Mapping citations (points, lines, regions) • Hot and cold zones • Process summary • Future plans • Bonus material

  3. Data Sources • Crashes • Paper crash reports (ECrash) • Mapable by route & milepost • Three month lag on most crashes • Complete Alabama data for past 15 years • Citations • ECitation • GPS • Two to three day lag on most citations • State trooper and some municipalities (Oldest data 2002) • Officer Locations • Real-time for some troopers • Plan to recorded positions periodically

  4. Starting Point • The questions • When & where should officers patrol to reduce fatalities and serious injuries? • How is “the answer” best presented? • How should recommendation effectiveness be assessed? • Conventional wisdom: • Position enforcement operations in high crash locations (“hotspots”)

  5. Crash Points4 years of mileposted crashes

  6. CrashesPer TrooperPost

  7. Segments Instead of Points • Five-mile segments • Reflect overall activity within a particular segment • A coarser-grained look at activity than simply displaying individual crashes

  8. Crashes as Graduated Lines

  9. Other Ways to Slice • Look at subsets of crashes: • Fatalities • Injuries • Alcohol • Etc. • Overlay other types of data: • Traffic volume • Roadway characteristics • Enforcement patterns

  10. Electronic Citations in Alabama • Initiated in June 2002 • Approximately 420,000 transactions to date: • 360,000 citations • 60,000 warnings • 1700 transactions per day • Deployment • Most state troopers (around 450 officers) • 91 officers at 10 local agencies • 46 agencies in progress • Real-time citation GPS locations

  11. Citation Points GPS

  12. Citations Per Post

  13. Citationsas Graduated Lines

  14. Hot & Cold Zone Designation

  15. Computing Hot/Cold Zones • Based on trooper post • Hot zone - 5-mile segments where: • Crashes exceed the post average for crashes • Citations are below the post average for citations • Cold zone - 5-mile segments where: • Citations exceed the post average for citations • Crashes are below the post average for crashes • A possible officer deployment strategy: • Route officers to hot zones • Route officers away from cold zones, except where they overlap hot zones

  16. Above and Below Post-Average-CrashesPer 5 Mile Segment Mobile Post

  17. Above and Below Post-Average-CitationsPer 5 Mile Segment Mobile Post

  18. Hot & Cold Zones • Hot Zones • Below Average Citations • Above Average Crashes • Cold Zones • Above Average Citations • Below Average Crashes

  19. Process Summary

  20. Next Step • Need to implement enforcement decisions based on this strategy • Need to monitor the effectiveness of shifting resources: • Does reducing citations negatively impact a low-crash coldspot? • Does increasing citations positively impact a high-crash hotspot? • Based on the results of this evaluation, continue to shift resources • Ultimately: • Make enforcement decisions based on data, not feel

  21. Future Plans • Data quality and timeliness: • Obtain 85-90% of citation data electronically (with GPS coordinates) • Obtain real-time crash data with GPS coordinates using ECrash • Incorporate officer location data • Analyze crashes and citations and officer patrol locations • Identify routes, not just locations • Develop more sophisticated algorithm for identifying hot & cold zones

  22. Questions? • Contact information • dsteil@cs.ua.edu

More Related