Journal ArticleDOI
Strategic fleet planning for city logistics
TLDR
It is shown that in some cases traffic restrictions may actually increase the number of vehicles on the streets, and the benefits of operating a heterogeneous fleet of vehicles are studied.Abstract:
We study the strategic problem of a logistics service provider managing a (possibly heterogeneous) fleet of vehicles to serve a city in the presence of access restrictions. We model the problem as an area partitioning problem in which a rectangular service area has to be divided into sectors, each served by a single vehicle. The length of the routes, which depends on the dimension of the sectors and on customer density in the area, is calculated using a continuous approximation. The aim is to partition the area and to determine the type of vehicles to use in order to minimize the sum of ownership or leasing, transportation and labor costs. We formulate the problem as a mixed integer linear problem and as a dynamic program. We develop efficient algorithms to obtain an optimal solution and present some structural properties regarding the optimal partition of the service area and the set of vehicle types to use. We also derive some interesting insights, namely we show that in some cases traffic restrictions may actually increase the number of vehicles on the streets, and we study the benefits of operating a heterogeneous fleet of vehicles.read more
Citations
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Journal ArticleDOI
A concise guide to existing and emerging vehicle routing problem variants
TL;DR: Vehicle routing problems have been the focus of extensive research over the past sixty years, driven by their economic importance and their theoretical interest as mentioned in this paper, and the diversity of applications has motivated the study of a myriad of problem variants with different attributes.
Posted Content
A concise guide to existing and emerging vehicle routing problem variants.
TL;DR: This article provides a concise overview of existing and emerging problem variants of vehicle routing problems and organizes the main problem attributes within this structured framework.
Journal ArticleDOI
Charge scheduling for electric freight vehicles
TL;DR: A comprehensive mathematical model is developed and solved that incorporates a large variety of features associated with the use of EFVs, including a realistic charging process, time-dependent energy costs, battery degradation, grid restrictions, and facility-related demand charges.
Journal ArticleDOI
The adoption of green vehicles in last mile logistics: A systematic review
TL;DR: In this paper, the authors present a comprehensive literature review on studies investigating the adoption of green vehicles in urban freight transportation, paying specific attention to e-commerce, concluding that green vehicles are competitive in urban deliveries characterized by frequent stop-and-go movements and low consolidation levels while incentives are still necessary for their adoption.
Journal ArticleDOI
Continuous approximation models in freight distribution management
TL;DR: An overview of the literature on continuous approximation models in the context of distribution management can be found in this paper, where the seminal contributions of Beardwood, Halton and Hammersley, and Daganzo and Newell are described.
References
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Journal ArticleDOI
The fleet size and mix vehicle routing problem
TL;DR: This work describes several efficient heuristic solution procedures as well as techniques for generating a lower bound and an underestimate of the optimal solution to the problem of routing a fleet of vehicles from a central depot to customers with known demand.
Book
Logistics Systems Analysis
TL;DR: This monograph aims to describe, and also to demonstrate how to find, rational structures for logistics systems, including their operation and organization, and makes the point that detailed solutions can often be improved if preceded by the kind of exploratory analysis described here.
Journal ArticleDOI
Solutions applicable by local administrations for urban logistics improvement
TL;DR: In this paper, a compilation of the solutions or initiatives that can be implemented by local administrations in order to improve freight deliveries in urban environments is presented, which are classified into those related to public infrastructure, land use management, access conditions, traffic management, enforcement and promotion.
Journal ArticleDOI
The Distance Traveled to Visit N Points with a Maximum of C Stops per Vehicle: An Analytic Model and an Application
TL;DR: A simple formula to predict the distance traveled by fleets of vehicles in physical distribution problems involving a depot and its area of influence is developed.
Journal ArticleDOI
The length of tours in zones of different shapes
TL;DR: A simple strategy that yields good traveling salesman tours is presented, and the resulting tours are suboptimal but appear to be close to those that can be obtained by hand.