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