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Showing papers on "Fleet management published in 1988"


01 Jan 1988
TL;DR: In this article, the authors provide an example of how a particular problem can be approached from significantly different perspectives: deterministic transshipment networks, stochastic/nonlinear networks, Markov decision processes, and Stochastic programming.
Abstract: The dynamic vehicle allocation problem involves managing a generally large fleet of vehicles over time to maximize total profits. The problem is reviewed in the context of truckload trucking with special attention given to dispatching and repositioning trucks in anticipation of forecasted future demands. Four different methodological approaches are reviewed: deterministic transshipment networks, stochastic/nonlinear networks, Markov decision processes and stochastic programming. The methods are contrasted in terms of their formulation of the objective function and decision variables, the degree to which actual practices can be represented, and computational requirements. The paper provides an example of how a particular problem can be approached from significantly different perspectives. (Author/TRRL)

130 citations



Journal ArticleDOI
TL;DR: The purpose of this paper is to show that the heuristic and exact methods developed for the vehicle scheduling problem with time windows and with a single type of vehicle can be extended in a straightforward fashion to the multiple-vehicle-types problem.
Abstract: The vehicle scheduling problem is specified in terms of a set of tasks to be executed with a fleet of multiple vehicle types. The purpose of this paper is to formulate the problem and to show that the heuristic and exact methods developed for the vehicle scheduling problem with time windows and with a single type of vehicle can be extended in a straightforward fashion to the multiple-vehicle-types problem.

46 citations


01 Aug 1988
TL;DR: In this paper, the authors present a review of the state-of-the-art of in-vehicle navigation and mobile communications techniques and equipment, and identify seven priority projects to accelerate the design and manufacture of Canadian systems and to identify opportunities for the increased use of these technologies.
Abstract: Ontario Ministry of Transportation, Research and Development Branch Transport Canada, Transportation Development Centre E.R. Case (416) 2354676 The report presents a review of the state-of-the-art of in-vehicle navigation and mobile communications techniques and equipment. A features matrix is used to classify the equipment in terms of infrastructure relationship, navigation technology, system function, etc. Human factors implications are also adThe primary functions likely to be provided in future systems (eg., road map display, en-route conditions, vehicle/cargo position tracking) and their specific features are grouped under five application areas: travel advisory, fleet management, traffic management, mobile office, occupant activities and vehicle control. Likely user communities and Canadian hardware/software suppliers are described for a further perspective on future markets. Summaries of foreign programs are presented. Primary issues for the development of standards and regulations are discussed and preliminary (stop-gap) man-machine interface standards are recommended to ensure safe use of the various devices. The report identifies research, development and demonstration needs, and recommends seven priority projects to accelerate the design and manufacture of Canadian systems and to identify opportunities for the increased use of these technologies. Comments: This report is part of MTO Research and Development Project 25180.

10 citations


Journal Article
TL;DR: In this article, an optimal multiloader-truck fleets are investigated, and sensitivity of the production cost to the key variables is analyzed, including cost-capacity and capacity-horsepower relationships for trucks and loaders.
Abstract: Loaders and trucks are often used in earthwork projects. In major earth-moving operations, careful selection of the number of machines used and the size of the equipment can produce substantial savings in both time and cost. Currently, the method available for determining the optimum size-number combination for loaders is comparison of all possible alternatives. This is a tedious and time-consuming task, especially if a large volume of soil must be hauled, requiring several loading units. In this study, optimal multiloader-truck fleets are investigated, and sensitivity of the production cost to the key variables is analyzed. The cost-capacity and capacity-horsepower relationships for trucks and loaders are investigated by using published equipment specifications and cost data.

5 citations


23 Sep 1988
TL;DR: The Hunter Vehicle Tracking System (VTS) as discussed by the authors is a geodetically referenced vehicle tracking system that can accept inputs from sensors of navigational receivers such as GPS (Global Positioning System) and Loran-C. The block diagram of the system is presented, and elements of the in-vehicle unit (IVU) and the dispatch control unit (DCU) are studied.
Abstract: The Hunter Vehicle Tracking System (VTS) is presented. The block diagram of the system is presented, and elements of the in-vehicle unit (IVU) and the dispatch control-unit (DCU) are studied. Some practical considerations about the communications links are presented. Map database generation from common geodetically referenced data sources such as the 7.5-min USGS quads is discussed. Implemented as a geodetically referenced system, the VTS can accept inputs from sensors of navigational receivers such as GPS (Global Positioning System) and Loran-C. A comparison of results between GPS and Loran is presented. >

4 citations


Journal ArticleDOI
TL;DR: In this article, the authors present the problems of urban transportation in developing cities and identify the need for effective vehicle scheduling, where the deficit function approach and the practice of the transit operator gives the same fleet requirements.
Abstract: This paper presents the problems of urban transportation in developing cities and identifies the need for effective vehicle scheduling. How the deficit function approach and the practice of the transit operator gives the same fleet requirements is highlighted at the beginning. The concepts of Quick Trips and Cut Trips are introduced in the middle of the paper and procedures are developed to insert these trips in the trip schedule to achieve one unit of saving in the total fleet requirement on every fixed route. The procedures developed here are not only applicable to road transport systems but also to suburban railway systems in most of the developing countries.

4 citations



Journal Article
TL;DR: Objectives for an exchange are recommended and data, information, and knowledge that should flow through an Exchange are discussed and the partitioning of exchange flows into levels is highlighted.
Abstract: Exchanges for bus equipment and bus fleet performance data, equipment management information, and fleet management knowledge, following several different formats, have been proposed and attempted. However, the objectives and structure of the proposed exchanges are usually poorly defined. In this paper objectives for an exchange are recommended and data, information, and knowledge that should flow through an exchange are discussed. Highlighted in the paper is the partitioning of exchange flows into levels. Data flows represent the least processed level of exchange, information flows represent processed data, and knowledge flows are the most highly processed level of exchange. The more highly processed the exchange, the less interpretation is required before application. For the exchange to be of maximum value, it should provide information on all three levels.

2 citations


01 Dec 1988
TL;DR: An interview with JIM ANSELMI, CENTRAL AUTOMOTIVE DIVISION, PORT AUTHORITY OF NEW YORK and NEW JERSEY can be found in this article.
Abstract: INTERVIEW WITH JIM ANSELMI, CENTRAL AUTOMOTIVE DIVISION, PORT AUTHORITY OF NEW YORK AND NEW JERSEY

1 citations


01 Jan 1988
TL;DR: In this article, the authors designed a project to measure the effects of an Intelligent Transportation System (ITS) technology shortly after it had been developed and implemented by a courier company, and the report of the study details the effectiveness of the technology and the software development process.
Abstract: Interest in the effects on businesses that have implemented Intelligent Transportation System (ITS) technologies has been growing. And, as the federal and state governments have begun to realize, without proof of the advantages inherent in these technologies transportation companies have been reluctant to acquire them. In response to this interest, the Center for Transportation and Land Policy in The Institute of Public Policy at George Mason University designed a project to measure the effects of an ITS technology shortly after it had been developed and implemented by a courier company. The report of the study details the effectiveness of the technology and the software development process. The report includes descriptions of the development process, the software product, and the methodology devised to measure the productivity factor and the results of surveying drivers and dispatchers before and after implementation.