crash data: how kentucky improved their system
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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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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9
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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