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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...
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Citations
... Offei et al. developed statistical models that explore the relationship between the high percentage of trucks and crash rates (27). The result showed that crash rates increase with an increasing percentage of trucks at various locations with specific road and weather conditions. ...
The State of Wyoming road network is characterized by heavy truck traffic. In 2015, truck traffic was approximately 22% of vehicle miles traveled (VMTs) along all routes in Wyoming, according to the WYDOT Annual Traffic Report. The heaviest truck traffic exists along I-80 with about 47% truck VMTs. Trucks have significantly different physical and driving characteristics than passenger cars, especially on grades, which has impacts on operational efficiency, safety, and pavement deterioration. The presence of heavy vehicles reduces the capacity of freeway segments, with the reduction being more significant along specific grades. This study focuses on the benefits of climbing lanes on operations and safety of freeway truck traffic. Various methodologies were used in this assessment. The results show that the addition of climbing lanes reduces delays and increases overall traffic speeds on upgrades, and can reduce the total and truck-related crashes from 6% to 34%, and from 1% to 16%, respectively, depending on the analyzed location and applied methodology.
... The severity of crashes was significantly higher during adverse weather and road conditions. Offei et al. developed statistical models to explore the relationship between the high percentage of trucks and crash rates (12). The results showed that crash rates increase with an increasing percentage of trucks at various locations with specific road and weather conditions. ...
The State of Wyoming experiences a high percentage of truck traffic along all its highways, especially Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns. This paper presents a safety analysis and a development of safety performance functions (SPFs) along I-80, with a focus on truck crashes. Nine years of historical crash data in Wyoming (2008–2016) were used to observe the involvement of light, medium, and heavy trucks in crashes. Analysis of the major contributory factors showed that 54% of the total truck-related crashes occurred during icy road conditions and about 46% during snowy weather conditions, and approximately 45% involved driving too fast and driving in improper lane. The analysis also included segments with horizontal curves and vertical grades and their impacts on truck crashes. The crash rate analysis showed higher truck crash rate compared with total crash rate considering equal vehicle miles traveled as exposure. A zero-inflated negative binomial model was applied to develop Wyoming-specific SPFs for various truck crash types. The effects of traffic, road geometry characteristics, and weather parameters influencing different truck-related crashes were quantified from these models. Downgrades and steep upgrade sections were found to increase truck-related crashes. The number of rainy days per year was found to be a significant variable affecting truck-related crashes. On the other hand, the presence of climbing lanes has significant safety benefits.
... Ghariani (2001) studied ten years of truck crash data from 1991 to 1999 obtained from Texas Department of Public Safety and found that a significant majority of the crashes occurred during day time. Similar trends were found in the rural freeways of Wyoming and Nebraska for the year 2000-2009 (Offei and Young, 2014). Knipling and Bocanegra (2008) analyzed the frequency of crash occurrence of combination unit trucks and single unit trucks from the truck crash causation study data (LTCCS) and found that the majority of the crashes occurred during the day and especially during rush hours. ...
This study explores the safety and operational performance along I-80, with a
focus on the benefits of climbing lanes along steep grades.
