Abstract
Three types of more productive trucks used in the Western United States are described—the Rocky Mountain double, the Turnpike double and the triple trailer combination. These are generically referred to as Longer Combination Vehicles (LCV). Their route systems and the legal basis of operation under special permit systems are outlined. Various measures of LCV performance, productivity, cost benefits, and infrastructure effects are reviewed. The superior safety record of LCVs is ascribed to the evolution of mechanical improvements, to experienced drivers and to state regulation and enforcement. Future expansion of LCV operations to improve the regional economic position is discussed against a backdrop of forces and issues which include environmental considerations, tax pressures, labour resistance and historic railroad opposition.
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