Information Technology Reference
In-Depth Information
lines at the Léon Blum bus stop, etc.) and most of the connections have two or three
lines.
The criteria characterizing the network (transportation modes, sectors, frequency
of lines, types of connection) have enabled a sample of contexts to be defined that
must take the observations into account [VAL 06]. For example: the tram line with a
high frequency; reliably frequent bus routes; bus routes with a low frequency;
average stations with two connections in north and south sectors; great connections
with many exchanges in the center of town and towards the outside; small stations;
etc.
2.5.2.
The methodology of data collection
The collection of data concerning the use of transport and information needs of
users has been carried out by observing real situations and according to two types of
protocol: the monitoring of users making a journey that they had planned and the
actualization of scenarios that enable certain tests to be planned and expanded upon.
2.5.2.1.
Actual or constructed journeys
For passengers, the contexts are linked to the notion of journeys. The choice of
observation protocol was therefore made by monitoring users during their travels on
real life trips to observe how they manage information in a context in which things
are working normally. Having said this, the study was oriented towards disrupted
situations, whether planned (demonstrations, road/engineering works) or unforeseen
(traffic jams, accidents, breakdowns). It was necessary to be sure of being able to
observe disruptions during the data collection phases. The decision was therefore
made to construct scenarios with one or several fictitious disruptions (blocked
connection, interrupted line or inaccessible station). This method is often used at
different phases of the design [DRO 01], [MAL 94], [VAL 93]. In the P@ss-ITS
project, the journeys constructed therefore made it possible to introduce numerous
potential events and to manage the distribution of journeys in the network to take the
variability of contexts into account.
Each public transport user was requested for around two hours, which allowed
them to carry out a return journey. For example, starting from the university at noon,
“you will go to the village hall of Saint Pryvé to take a document”; this journey
meant walking to the tram station, taking the northbound tram, and changing at the
Quai de l'Horloge station, taking a bus line towards Candolle. At this stage the
observer signaled a “disruption” requiring the person to get off before Candolle to
change bus line, etc.
