From average travel time budget to daily travel time distributions:
 an appraisal of two conjectures by Koebl and Helbing and some consequences

                   Jean-Paul Hubert and Philippe L. Toint

                              Report TR05/05, 2005
                       Groupe de Recherche sur les Transports
                    Facultés Universitaires Notre-Dame de la Paix
                      Rue de Buxelles 61, 5000 Namur, Belgique

An analysis of three travel surveys (in Britain, Belgium and France) is used
to investigate conjectures by Koebl and Helbling (2003) relating mode choice
and energy expenditure as well as distribution form. The analysis shows the
link with energy expenditure to be questionable, but also provides alternative
views of travel time analysis.  In particular, weekly travel time budgets are
shown to present different characteristics than the more commonly used daily
ones, reinforcing the argument for inclusion of weekly regularities in travel
behaviour analysis and modelling.