François Combes

François Combes
Université Gustave Eiffel · Department of Planning, Mobilities and Environment (AME)

PhD

About

66
Publications
11,052
Reads
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268
Citations
Citations since 2016
26 Research Items
215 Citations
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20162017201820192020202120220102030
Introduction
François Combes is currently director of the Laboratoire des Systèmes Productifs, Logistique, Organisation des Transports et Travail (SPLOTT) , at Institut Français des Sciences et Technologies des Transports, de l’Aménagement et des Réseaux (IFSTTAR), in France. François does research in transport economics applied to freight transport and logistics.
Additional affiliations
January 2017 - present
Université Gustave Eiffel
Position
  • Head of Department
January 2014 - December 2016
Université Gustave Eiffel
Position
  • Research Associate
September 2009 - December 2013
University of Paris-Est
Position
  • Researcher

Publications

Publications (66)
Article
Full-text available
Urban logistics is a key step in distribution chains. It implies the use of trucks in congested areas, and generates numerous externalities (congestion, noise, pollution, etc.). Supply chain configurations and consumer behaviors are undergoing deep changes, with a significant increase in the intensity of urban logistics and a diversification of del...
Article
Full-text available
Freight transport demand models are generally based on administrative commodity type segmentation which are usually not tailored to behavioral freight transport demand modelling. Recent literature has explored new approaches to segment freight transport demand, notably based on latent class analysis, with promising results. In particular, empirical...
Preprint
Full-text available
Urban logistics is a key step of distribution chains. It implies the use of trucks in congested areas, and generates numerous externalities (congestion, noise, pollution, etc.). In addition, supply chain configurations and consumer behaviors are undergoing deep changes. This implies a significant increase urban logistics’ intensity, and a diversifi...
Presentation
Full-text available
Truck platooning is a technology where trucks are coupled in virtual platoons on open roads. This coupling allows to reduce the distance between trucks in a platoon, which leads to fuel savings for the leader and follower vehicles. This presentation is focused on the issue of the market uptake of platooning. This is a complex topic: first, assuming...
Technical Report
Full-text available
L’objectif de cet article est de fournir quelques éclairages sur le sujet du report modal en transport de marchandises. Il procède en trois parties. Dans un premier temps, la gestion des chaînes logistiques par les chargeurs est expliquée et illustrée par quelques exemples : comment gèrent-ils leurs flux et leurs stocks ? Quelle est influence des c...
Conference Paper
Full-text available
This paper presents an overview of changes expected in the role of LCV's in Urban Logistics due to technological changes. It is divided into the following sections; Urban population and logistics; Light commercial vehicles and their use in urban logistics; Transition to Autonomous, Connected, Electric and Shared (AECS); and Regulation of vehicles....
Conference Paper
Full-text available
The objective is to study the impact the deployment of autonomous vehicles may have on freight and logistics from an economic point of view. We focus on interurban transport operations made by road and propose quantitative estimations of the outcomes of two scenarios where the automation technology is sufficiently efficient to remove the need of a...
Article
Full-text available
City Logistics is characterized by multiple stakeholders that often have different views on such a complex system. From a public policy perspective, identifying stakeholders, issues and trends is a daunting challenge, only partially addressed by traditional observation systems. Nowadays, social media is one of the biggest channels of public express...
Article
Full-text available
Le transport de marchandises est une activité économique essentielle. La structure des tissus économiques et industriels français et mondiaux implique des mouvements importants de marchandises; la performance du transport de marchandises est donc un facteur important de performance économique. Cependant, il génère plusieurs impacts négatifs (réchau...
Technical Report
Ce rapport a pour objectif de présenter diverses recommandations concernant l'évaluation socio-économique de projets routiers. En particulier, les sujets suivants sont traités: analyse stratégique, étude de trafic, analyse coût-bénéfice, prise en compte des incertitudes.
Conference Paper
Full-text available
City Logistics is characterized by multiple stakeholders that often have different views of such a complex system. From a public policy perspective, identifying stakeholders, issues and trends is a daunting challenge, only partially addressed by traditional observation systems. Nowadays, social media is one of the biggest channels of public express...
Presentation
Full-text available
This is the presentation of the paper "UNSUPERVISED MACHINE LEARNING TO ANALYSE CITY LOGISTICS THROUGH TWITTER" at the 11th International Conference on City Logistics on 12th – 14th June 2019 in Dubrovnik, Croatia. Abstract: City Logistics is characterized by multiple stakeholders that often have different views of such a complex system. From a pub...
Technical Report
Full-text available
Road freight transport is an essential economic activity. It currently relies on the following resources : infrastructure, vehicles, workforce, and energy. If trucks are partially or totally autonomous, the cost structure of freight transport will change substantially. The cost structure of freight transport will change; freight carriers will reorg...
Article
Full-text available
This paper presents a structural microeconomic model of the choice of warehouse location in urban logistics. The model is theoretical and analytical. It brings the focus on operational constraints, their diversity, and their influence on costs. The location decision is modeled as a trade-off between land rents (making it costly to locate close to t...
Conference Paper
Full-text available
This paper presents a structural microeconomic model of the choice of warehouse location in urban logistics. The model is theoretical and analytical. It brings the focus on operational constraints, their diversity, and their influence on costs. The location decision is modelled as a trade off between land rents (making it costly to locate close to...
Technical Report
Full-text available
Ce document constitue le « rapport descriptif » des scénarios de décarbonation profonde du transport de marchandises en France à l’horizon 2050. Il s’adresse aux différents acteurs de la société qui souhaiteraient découvrir deux histoires cohérentes des principales transformations (sociétales, organisationnelles, technologiques et politiques) menan...
Article
Full-text available
Transferability is seen as one important rationale for justifying the application of behavioral transport demand models. Concerning freight transportation, behavioral models of shipment size choice gain more and more attention by modelers. However, the transferability of prevalent shipment size choice models is complicated due to different function...
Conference Paper
Full-text available
The heterogeneity of supply chains is an important challenge for analysing, understanding and modelling freight transport systems. This paper explores a solution based on a Total Logistics Cost approach and Latent Class Analysis in order to introduce efficiently (i.e. without adding too many degrees of freedom) relevant information in models of cho...
Presentation
Full-text available
The paper’s objective is to assess the external costs of urban freight transport while taking into account the interaction between passenger transport and freight transport. The paper applies an aggregate approach: an urban freight generation and distribution model (FRETURB) and a passenger trafic model (NODUS) are combined in order to calculate th...
Conference Paper
Full-text available
This paper analyses with an analytical microeconomic model how warehouse location depends on the other economic parameters of urban logistics, such as transport cost, freight demand, and rents. In the model, a warehouse located at the outskirts of a city dispatches trucks towards the city center in order to deliver and pickup commodities. A logisti...
Article
Full-text available
In passenger transport, hub-and-spoke networks allow the transportation of small passenger flows with competitive frequencies, in a way that direct line networks cannot. Equivalently, in freight transport, it can be expected that small shipper-receiver flows of high added value commodities transit through hub and spoke networks, while larger shippe...
Article
Consider a population of agents who choose one among a set of destinations located along a rectilinear road. Each of these destinations has a certain utility, modeled by a random variable. We compare a situation where the agents have to explore the destinations to observe the value of their utilities, to a situation where they know these values bef...
Conference Paper
Full-text available
This study estimates a disaggregate freight generation model with the French shipper survey ECHO. This survey contains accurate information about French shippers, with variables describing their economic activity, the diversity of their production, their relationships with their clients and carriers, etc. These variables and their influence on prod...
Conference Paper
Full-text available
This article presents an empirical analysis of the prices' structure in the road freight industry. For that purpose, we use the French ECHO survey that provides detailed information on the characteristics of shippers and transport operators. First, we show that road freight prices are not a simple linear function of ship-ments' attributes. Second,...
Conference Paper
Full-text available
L’usage au quotidien des technologies de l’information et de la communication (TIC) au cours des déplacements — non seulement de personnes, mais également de marchandises — engendre des quantités importantes de données à la fois identifiées, datées et localisées. C’est le cas notamment des systèmes de billettique dans les transports en commun, des...
Chapter
Inventory theory is concerned with the optimal operation of production, logistics, transport, etc. It can prove particularly useful to freight transport modelling. Indeed, analysing inventory theoretic models from a microeconomic perspective explains a lot about the preferences of shippers regarding freight transport. This chapter reminds some simp...
Article
Full-text available
A model of freight mode choice was developed on the basis of the economic order quantity model, an inventory theoretical model of optimal shipment size. Shipment size is not explicit in the mode choice model; however, the specifications of the utilities associated with each transport mode account for shipment size and transport mode, which are two...
Article
The objective of this paper is to analyse in detail the structure of road freight tariffs. To do so, a market equilibrium model is designed, with a detailed representation of the technology of carriers, and of the logistic decisions of shippers. In particular, shippers send shipments of endogenous sizes, which are consolidated by carriers in vehicl...
Article
This paper shows that the particular conditions under which a cellular phone network is operated underground can make it possible to measure passenger flows in an underground transit system. With the help of the mobile network operator Orange, some experiments have been conducted in Paris underground transit system to assess the potential of this n...
Article
Full-text available
This paper shows that the particular conditions in which a cellular phone network is operated underground can make it capture a significant part of particular events like entries in tunnels. With the help of the mobile network operator Orange, some experiments have been conducted in Paris’ underground transit system. Results show that good estimate...
Article
Full-text available
In densely urbanised areas the structure of the transport systems becomes quite complicated. Many types of transport services are available and many types of modes are being used, thus offering a wide palette of transport options. How do all these transport services and modes relate to each other? In practice it proves to he quite hard to define su...
Article
Full-text available
Along a transit line, vehicle traffic and passenger traffic are jointly subject to variability in travel time and vehicle load hence crowding. The paper provides a stochastic model of passenger physical time and generalized time, including waiting on platform and in-vehicle run time from access to egress station. Five sources of variability are add...
Article
Full-text available
The choice of shipment size in freight transport depends on the logistical imperatives of shippers and the technical possibilities of carriers. The choice is closely related to the mode of transportation and therefore important for public policy. The theory of optimal shipment size and mode choice is robust. Numerous inventory-theoretical models of...
Article
Full-text available
Purpose The focus of this paper is to enhance our observation and knowledge of interurban road freight transport. It explores some possibilities for improving roadside freight surveys, usually used to gather origin-destination data. Methodology To achieve this, new questions are added to a standard roadside survey form, and the enhanced survey for...
Book
The value of time, in freight transport, comes from how supply chains work. This chapter discusses this matter and some implications including the endogenous nature of the value of time.
Article
Full-text available
The paper presents a theory of the value of time in freight transport based on inventory theory. On the basis of the work of Arrow et al. (1958) and Baumol and Vinod (1970), the paper derives a model of the willingness of a shipper to pay for a reduction of the transport leadtime in the case of a simple supply chain, where the demand is random, but...
Article
Full-text available
We set a framework where an individual has to choose one among a set of spatially distributed activities. The individual knows the price of each activity, as well as the distance to reach it. She has either full or zero information about each activity's quality. Qualities are modeled by i.i.d. random variables. Under the full information regime, th...
Article
Full-text available
Classic spatialised freight transport models are based on a four stage representation of the decisions shippers and carriers take. The decisions this representation distinguishes are: emitted and received flow rates, supplier or receiver choice, transport mode, itinerary. However, freight transport is discrete by nature: commodities are moved by bu...
Article
Full-text available
Numeric, spatialised models for the simulation of freight transport demand have long been inspired by the models for passenger demand. However, in recent years, specific methods have been developped to represent some aspects that are specific to freight transport, including the relationship between freight transport and logistics, and the specific...

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Projects

Projects (3)
Project
Impact assessment of multi-brand platooning