Estimated Data Production for Urban Goods Transport Diagnosis - Sustainable Urban Logistics: Concepts, Methods and Information Systems - page 119

implementation of the survey, it was important to think jointly on the capability of
collecting pertinent data and how they could be used to model the impacts of
UGM. Separate reflection would lead to incompatibilities or large gaps in data, and
consequently to a less representative model due to a higher object reduction
(Bonnafous 2001 ).
In order to capture the pertinent data, three surveys were carried out (Fig. 3 ):

• An ''establishment survey'' through a stratified sample (according to the activity
and the number of jobs in each establishment). Each establishment describes all
its delivery and pick-up operations during a week. As the questionnaire is rather
long and hard to fill in, the best solution is face to face administration in two
visits: during the first visit, information about the description of the establish-
ment, its environment and the approximate number of trips made by drivers in a
standard week is gathered and a log book is left for a week, in order to collect
the description of all the deliveries and pick-ups. During the second visit, the
log-book is controlled and collected by the pollster.
• A ''driver survey'', with the participation of the drivers who deliver or pick-up
the goods in the establishment. A brief questionnaire is supplied by the estab-
lishment for the survey week. It is returned by mail. In addition, in order to
obtain a more thorough description of the rounds, this survey is then supple-
mented by an ''embedded survey'', in which the pollster is taken on board the
truck in which a GPS is installed.
• A third survey of the main transport companies (''haulier survey'') operating in
the city permits describing the main breakups of loads from the principal supply
chains and to describe the main transfers of flows with the city's outskirts

An exhaustive registry of the establishments is regularly updated by the French
Statistics Institute (SIRENE-INSEE). It contains the name, address, activity

Fig. 3 The three linked French UGM surveys (Routhier 2013 )