One of the objectives of the Smart Cities is the efficient and sustainable use of transport infrastructures. Sustainability is understood as the application of new technologies to minimize the loss of time and energy, and at the same time, to improve the satisfaction of citizens. Achieving this objective calls for making use of the mobility data collected from the existing transport infrastructure and services, as well as from the citizens themselves. After the data collection process, information must be stored (use of open data bases) and made accessible (available) to specialized applications and users. This paper highlights the opportunity to take advantage of emerging technologies, like the open source data platform CKAN, or to use services for data linked queries (SPARQL endpoint). As an example of application of these technologies to the transport domain, two use cases are presented: the proposed implementation of an information access point and a national project called "CONECTA".