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Crash Data: How Kentucky Improved Their System
Eric Green, MSCE, PE, GISP
University of Kentucky
Kentucky Transportation Center
Improving Crash Data in Kentucky
• Traffic Records Committee (KTRAC)• Crash Location Research• Crash Query software• Crash Mapping (GIS)• Safety Circuit Rider Program• HSM
KTRAC
• SAFETEA-LU• Section 408• Programs to improve the timeliness,
accuracy, completeness, uniformity, integration, and accessibility of traffic safety programs
Crash Locations
• Location, location, location• GPS units issued to police in 2000• Evaluated accuracy of location data in
2004– Recommendations made– Software developed
Paper Reports
• Submitted manually• GPS from Magellan,
Google® Maps, 911 system
• County, Route and Milepoint (CRMP) using reference system
Map Click
eCrash KYOPS
• MapIt• Added October 1st
2007• CRMP data linked
to GPS• Between/Intersect
streets• Searchable• RT Unique:
“034-US-0068 -000”
9
Crash Locations
• Follow-up study in 2010• Investigated crash data since the
MapIt system was added to eCrash
Crash Data Potted by Lat/Long
Crash Data plotted by Lat/Long Showing County Check
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
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
Critical Rate Calculator CRC
CRC Results
Buildup
Buildup – Results
Public Crash Website
Crash Results
Map Results
Secured Crash Website
Crashes by Type
Crash Densities
1 F = 12 PDO1 I = 3 PDO
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
Safety Circuit Rider
Highway Safety Manual
• Science-based• Combines predicted and actual
crashes• Doesn’t assume crashes are normally
distributed• 10 years in the making
Safety Performance Function
Four-Lane Divided Road - Total Crashes Per Year
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
Highway Safety Manual
• Safety Analyst• www.highwaysafetymanual.org • FHWA-NHI-380106:
– Google search above– 12 Hours– Free!
Questions?
• Eric Green, GISP, MSCE, PEKentucky Transportation CenterResearch Engineer140C Raymond BuildingUniversity of KentuckyLexington, KY 40506-0281 [email protected]: (859) 257-2680