Daily Mobility of the Inhabitants of Lille Up to 2030

By Krakutovski, Zoran; Armoogum, Jimmy | Population, July 1, 2007 | Go to article overview

Daily Mobility of the Inhabitants of Lille Up to 2030


Krakutovski, Zoran, Armoogum, Jimmy, Population


The cross-sectional household travel surveys conducted in the major French agglomerations provide a rich data source on daily mobility, analysed here in an original manner by Zoran KRAKUTOVSKI and Jimmy ARMOOGUM. Their primary purpose is to obtain information for urban planners on the modes of transport used by city dwellers and on their reasons for travel. However, the fact that they are standardized and conducted on a regular basis means that they can also be used not only to identify patterns in daily mobility, but also to analyse changes in behaviour between successive cohorts of city-dwellers and, above all, to forecast future trends by age, taking account of the particular experience of the cohorts observed.

As society develops, the number of contacts and of economic and cultural exchanges increases, while the reasons for travel and the geographical areas covered become more varied. People make daily trips within a defined territory to carry out extra-domestic activities for either work-related or personal reasons. The massive use of private vehicles has been a key factor in transforming territorial organization, by dispersing both activities, and above all housing, over much larger areas, and the rapid growth in household car ownership in the 1960s and 1970s spawned numerous transport planning studies. Planning at that time focused mainly on the creation of transport infrastructures able to meet a high demand for mobility, chiefly in the large urban areas or agglomerations. P. Merlin (1991) observed that "studies have concentrated on urban transportation systems, which have played a pioneering role in clarifying the issues, concepts and methods of planning".

Of the many factors involved in spatial change, urban policies make a lasting impact on how cities function. Public investment choices in urban transport facilities (subways, trams, expressways) are crucial for a city's development. The public authorities need to possess the right information to make coherent transport policy choices, particularly regarding new infrastructure, whose irreversible character calls for a long-term vision of demand.

In addition, mobility has become a key focus of concern with regard to energy consumption, land use and environmental issues. Public sensitivity over these questions is growing in the developed countries and the public authorities' efforts to mitigate the harmful impacts of the transport sector are under close scrutiny.

Many of the transport models developed to date consider a static and stable environment in which the modelled and observed phenomena remain unchanged over time. Yet this stability is problematical when studies concern mobility behaviour over the long term. Mobility is not independent of the transformations affecting society or of the habits of city-dwellers. Moreover, the intensity of these changes is not constant but varies with socioeconomic trends and local population dynamics.

Overall behaviour in large groups of individuals at the aggregate level often appears difficult to explain. When the population is heterogeneous, projections based on analysis of general trends do not yield a clear picture of potential future developments. Nor does cross-sectional analysis seem appropriate in times of demographic, economic and social change. It transposes into trends the differences observed between individuals at a particular point in time, often leading to biased estimates (Madre and Gardes, 2005). Dynamic approaches to modelling daily mobility are thus needed.

By decomposing a phenomenon into different temporal effects, the factors responsible for its variation over time can be identified. Among several possible approaches, that based on the role of age has long been used in various research fields, notably in economics (Kessler and Masson, 1988). But the age effect is not sufficient to explain the changes observed: the dynamics of behaviour also depend on the cohorts involved. …

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Daily Mobility of the Inhabitants of Lille Up to 2030
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