United States Department of Transportation
i
Estimating the off-network presence of STAA dimensioned vehicles on North Carolina roadways using CMV crash data, 2001-2005
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2008-05-06
[PDF-2.39 MB]
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Edition:Final report; September 1, 2006 to August 31, 2007
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Abstract:The present study used commercial motor vehicle (CMV) crash data from NCDOT’s Traffic Engineering Accident
Analysis System (TEAAS) to infer the presence and relative extent of STAA dimensioned vehicles operating
beyond the 3-mile buffer of the present STAA Truck Network in North Carolina. STAA dimensioned vehicles
include trailers 53ft or greater in length and double trailers. STAA routes in NC constitute only about 8 percent of all
state-maintained roadway miles. The data showed that approximately 87 percent of all large truck crashes took place
on STAA network roads during the period 2001-2005. While only 13 percent of large truck involved crashes took
place on roads ‘off’ the network, the likelihood of any given off-network crash involving a fatality was twice that of
a crash taking place on the network. Off network crashes involving large trucks are problematic for reasons other
than safety, especially in metropolitan areas where operations, irrespective of crash involvement, are associated with
traffic delays (due to the maneuvering/turning requirements of larger vehicles) and infrastructure damage. The report
provides GIS ‘maps’ of each of the eight NCSHP troop areas, the network and its 3-mile buffer and the location and
severity of all large truck-involved crashes reported as taking place ‘off’ the network. The report also provides a
detailed description of the attributes of off-network crashes for 2001-2005 for each NCSHP troop. Several criteria
were explored as a means for ranking troop areas in terms of need for STAA improvements. The report also
identifies specific off-network routes at the county and troop levels having the highest numbers of crashes per mile.
Recommendations are provided for ‘next steps’ as well as a plan for technology transfer and implementation.
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