This article will give an overview about telecommunications in the world of Intelligent Transportation Systems and Smart Devices, and about their ability to comply with the needs of the new Systems. A distinction will be made between critical services which are dimensioning ones, and conventional services when available from the open market. A functional analysis will be used to outline an Architecture, which is telecom-centered, with both transit and distribution facets. State-of-the-Art solutions for large-scale wireless accessing and networking will be reviewed, and characterized according to their degree of suitability. As a conclusion, new axes for telecom research and development will be identified, in order to support new applications, noticeably safety applications.