RELATED WORKS
The use of the new Information and Communicationstechnologies (ICT), especially those that are able to operate
in mobility ambient, are described in several works in the bibliography. In this sense, Giannopoulus [1] studies the
changes related to the way transport companies will work, particularly in the case of the distribution of information to
the traveller. According to this author, these systems should be efficient, trustworthy and easy to use and with high
capacity to adapt to the needs and preferences of the users. Specifically in the field of the public transport accessibility,
Jakubauskas [2] analyzes how the use of Intelligent Transport Systems (ITS), where the ICT plays a key role, can improve the accessibility to the public transport by people with reduced mobility, identifying the main obstacles and offering solutions based on the use of ITS. There are several studies about the information required by travellers
in order to improve the interoperability of the public transport information systems. In this topic, the studies,
recommendations and models developed by national and international authorities, agencies and corporation are
relevant. The conceptual data models for public transport proposed by Transmodel [3] is the most relevant.
In the side of implementation, in the bibliography we can find enough references to works that describe specific
proposals of information systems for travellers. All of these implementations have several common properties, these are:
the client-server model is assumed using web technology and mobile telephony infrastructures and services are used
by users, which are the travellers, to access to on route travel information. For example, for blind people, we find
the works of Turunen [4] and Sanchez [5] that provides guiding audio information in a context of public transport,
where the user, through his mobile device (PDA or mobile telephone), makes use of the services. Barbeau [6] proposes
a system named Travel assistant Device (TAD) that provides users with special necessities that carry with them
a mobile telephone with GPS, with information about its trips, specifically to users that have previously planned their
journey; the system guides them by providing information in real time about its position, warning them in case they
move away from its route and notifying them when they have to ask for the stopping of the bus. Regarding
information system for tourist, we highlight the case of the system proposed by O’Grady [7] that provides information
on the route guiding a traveller to move from one point in the city to another on foot. Finally, for people without
special needs, Arikava [8] proposes a multi-modal transport information pervasive system.