This paper presents a heuristic column generation method for solving vehicle routing problems with a heterogeneous fleet of vehicles.The method may also solve the fleet size and composition vehicle routing problem and new best known solutions are reported for a set of classical problems. Numerical results show that the method is robust and efficient, particularly for medium and large size probl...

Crash incompatibility between disparate classes of passenger vehicles is an issue of growing global concern. There is widespread consensus, both in the U.S. and internationally, that any regulation or test procedure focusing on crash compatibility should be a globally harmonized standard. However, this may prove to be a challenging effort due to huge differences in U.S. and international fleet ...

The purpose of this talk is to describe industrial aspects of combined fleet composition and routing in maritime and road-based transportation, and to present the current status of research in the form of a comprehensive literature review. With a backdrop of industrial aspects, a categorized survey of relevant literature since the first published papers in the 1950’s is given. First, the litera...

A microscale emission factor model (MicroFacPM) for predicting real-time site-specific motor vehicle particulate matter emissions was presented in the companion paper titled "Development of a Microscale Emission Factor Model for Particulate Matter (MicroFacPM) for Predicting Real-Time Motor Vehicle Emissions". The emission rates discussed are in mass per unit distance with the model providing e...

The purpose of this paper is to describe industrial aspects of combined fleet composition and routing in maritime and road-based transportation, and to present the current status of research in the form of a comprehensive literature review. With a backdrop of industrial aspects, a categorized survey of relevant literature since the first published papers in the 1950’s is given. First, the liter...

The report describes a comprehensive vehicle fleet composition, utilization, and evolution simulator that can be used to forecast household vehicle ownership and mileage by type of vehicle over time. The components of the simulator are developed in this research effort using detailed revealed and stated preference data on household vehicle fleet composition, utilization, and planned transaction...

This paper evaluates how gasoline prices influences the average fuel economy of the existing automobile fleet. Higher fuel price affects fleet composition in two ways: immediate purchase decisions of new, more fuel efficient, vehicles and scrappage of old fuel inefficient gas-guzzlers. Gasoline costs account for 65% of the total operating costs of driving an automobile. Rational forward-looking...