The heterogeneous fleet vehicle routing problem is investigated using some adaptations of the variable neighborhood search (VNS). The initial solution is obtained by Dijkstra’s algorithm based on a cost network constructed by the sweep algorithm and the 2-opt. Our VNS algorithm uses several neighborhoods which are adapted for this problem. In addition, a number of local search methods together ...

In this paper, we consider a new variant of the Time-Constrained Heterogeneous Vehicle Routing Problem (TCHVRP). In this problem, the cost and travel time of any given arc vary by vehicle type within a heterogeneous eet. In particular, we make no assumptions about Pareto dominance across vehicles; nor do we assume that cost and time are correlated. Our research is motivated by situations in whi...

This paper describes a tabu search heuristic for a vehicle routing problem where the owner of a private fleet can either visit a customer with one of his vehicles or assign the customer to a common carrier. The owner's objective is to minimize the variable and fixed costs for operating his fleet plus the total costs charged by the common carrier. The proposed tabu search is shown to outperform ...

The Heterogeneous Fleet Capacitated Vehicle Routing Problem with Time Windows and ThreeDimensional Loading Constraints (3L-HFCVRPTW) combines the aspects of 3D loading, heterogeneous transport with capacity constraints and time windows for deliveries. It is the first formulation that comprises all these aspects and takes its inspiration from a practical problem of distributing daily fibre board...

American Airlines currently operates in excess of 550 aircraft and flies over 2200 scheduled flights a day to over 160 destinations worldwide. Maintenance planning in a route network of American's magnitude is a complex, decision-intensive task that is managed at the Maintenance Operations Center (MOC) in Tulsa, Oklahoma. The employees in this center are responsible for planning all maintenance...

To the Editor: Ezri et al.1 described serum electrolyte changes following ingestion of cathartics prior to bowel resection surgery. The authors dosed 90 mL of Fleet® Phospho-soda® to their subjects. This is twice the recommended dose of 30–45 mL according to the current professional Fleet® Phospho-soda® labelling.2 Fleet® Phospho-soda® should be used only at the recommended dosage and only in p...

The Indiana Department of Transportation (INDOT) spends approximately $30 to $60 million a year on deicing salt and operates fleet 1,000 winter operations trucks distributed among 140 locations. entire is now instrumented with location telematics, all new have integrated dash cameras, spreader application rate plow up/plow down into the telematics link. When storms occur, they varying regional ...

The future of U.S. transport energy requirements and emissions is uncertain. Transport policy research has explored a number of scenarios to better understand the future characteristics of U.S. light-duty vehicles. Deterministic scenario analysis is, however, unable to identify the impact of uncertainty on the future U.S. vehicle fleet emissions and energy use. Variables determining the future ...