Potential Use of Longer Combination Vehicles in Texas : Second-Year Report.
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2010-10-01
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Abstract:The second year of this study focused on Texas highway corridors carrying heavy truck volumes and examined LCV
operations—particularly infrastructure costs—to identify where the highest economic advantage from LCV implementation
would be achieved. First an Executive Summary of the entire study describes the two-year findings. Then Chapter 1 provides
a short background and summarizes the outlines of both reports. Chapter 2 covers the potential LCV impacts on the
pavements of the high volume heavy truck corridors (segments) on the TxDOT system. The work is a fundamental
contribution to estimating pavement life and critical in ensuring that any recommended increase of truck size or weight meets
the marginal cost rule. The chapter covers the method used to determine pavement life, together with the collection and
analysis of data required in the evaluation. It reports the characteristics, analysis, results, and conclusions for each of five
Texas corridors. The chapter then summarizes the findings for both rigid and flexible pavement and closes with limitations
and recommendations for additional research. Chapter 3 identifies LCV impacts on the bridges identified on the corridors
specified in Chapter 2. It describes the method selected to determine bridge impacts, including the traditional moment
analysis method and a fatigue moment analysis method that promises greater precision. The LCV types selected for study
analysis—97,000 lb tridem, 138,000 lb double 53ft, and a 90,000 lb double 53ft—are then introduced sequentially and the
results for both moment methods given. Results are then summarized with one surprising result. Chapter 4 provides the
findings regarding users, pavements, and bridges. The major recommendation of the advisory panel was a pilot study of LCV
types over a selection of Texas corridors that are economically attractive to truckers. Finally, a series of appendices covered
supporting material to the analytical work undertaken in the second year and the presentations made at the final study
workshop.
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