United States Department of Transportation
i
Quantifying the impact of large percent trucks proportion on rural freeways.
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2014-02-01
[PDF-3.85 MB]
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Abstract:The trucking industry continues to contribute significantly to the economy of the United States.
The surface transportation system has been a critical component for the movement of goods and
services by the trucking industry across the country. Recent decades have seen substantial
growth in freight miles traveled, due to globalization, trade growth, and improvements in
logistics and supply chain management. Although these developments have led to economic
growth, there has been a sharp increase in the proportion of freight/truck traffic traveling along
key routes that has caused significant interactions between trucks and other vehicles. These
interactions have raised safety and capacity concerns on the freeways.
Interstate 80 was identified for this research because of the high percentage of truck traffic (40%
-70%) that it carries. This Interstate is a popular route for most freight transporting goods from
the east (Chicago) to the west (California) and vice versa. Interstate 80 in the states of Wyoming
and Nebraska was selected as a test case for this research, which seeks to develop a statistical
modeling of the relationship between the high percent trucks and crash rates. Findings from this
research are intended to aid transportation managers when deciding on actions to take on
highway facilities carrying a large percentage of trucks.
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