Crash Data: How Kentucky Improved Their System

1. Crash Data: How Kentucky Improved Their System Eric Green, MSCE, PE, GISP University of Kentucky Kentucky Transportation Center

2. Improving Crash Data in Kentucky Traffic Records Committee (KTRAC) Crash Location Research Crash Query software Crash Mapping (GIS) Safety Circuit Rider Program HSM

3. KTRAC SAFETEA-LU Section 408 Programs to improve the timeliness, accuracy, completeness, uniformity, integration, and accessibility of traffic safety programs

4. Crash Locations • Location, location, location • GPS units issued to police in 2000 • Evaluated accuracy of location data in 2004 • Recommendations made • Software developed

5. Paper Reports • Submitted manually • GPS from Magellan, Google® Maps, 911 system • County, Route and Milepoint (CRMP) using reference system

7. Map Click

8. eCrash KYOPS • MapIt • Added October 1st 2007 • CRMP data linked to GPS • Between/Intersect streets • Searchable • RT Unique: “034-US-0068 -000”

10. Crash Locations Follow-up study in 2010 Investigated crash data since the MapIt system was added to eCrash

11. Crash Data Potted by Lat/Long

12. Crash Data plotted by Lat/Long Showing County Check

13. Conclusions and Recommendations 92% of all crashes were accurate compared to around 50% in the previous study Most of this improvement can be attributed to the implementation of the MapIt system in eCrash A large majority of incorrectly located were largely due to a lack of reference points The MapIt system currently requires user to know where they are on a map Identified errors should be investigated by KYOPS

14. Potential Improvements • Aerial photos • Integrated GPS receivers • Reference log data • Mileposts, bridges, culverts, etc. • Training • QC of location data • Contact specific agencies or evaluate county data • ‘Distance From’ glitch • Edits to check for county and distance between CRMP and GPS

15. Critical Rate Calculator CRC

16. CRC Results

17. Buildup

18. Buildup – Results

19. Public Crash Website

20. Crash Results

21. Map Results

22. Secured Crash Website

23. Crashes by Type

24. Crash Densities 1 F = 12 PDO 1 I = 3 PDO

25. Safety Circuit Rider • KY LTAP Stared in 2005 • SCR: Todd Morrison • Retired engineer from KYTC D3 • Technical assistance to counties and cities • Safety improvement workshop • Focus counties • RSA

26. Safety Circuit Rider

39. Highway Safety Manual Science-based Combines predicted and actual crashes Doesn’t assume crashes are normally distributed 10 years in the making

40. Safety Performance Function Four-Lane Divided Road - Total Crashes Per Year

41. General Form of PredictionMethodology WHERE: N = predicted accidents per year (road segment or intersection) Nbase = predicted accidents per year - base conditions C = calibration factor - convert predicted accidents to local conditions AMFn = accident modification factor – adds effects of specific site situation to base conditions

42. Highway Safety Manual • Safety Analyst • www.highwaysafetymanual.org • FHWA-NHI-380106: • Google search above • 12 Hours • Free!

43. Questions? Eric Green, GISP, MSCE, PEKentucky Transportation CenterResearch Engineer140C Raymond BuildingUniversity of KentuckyLexington, KY 40506-0281  egreen@engr.uky.eduPhone: (859) 257-2680