Rhône-Alpes is a major European transit hub, linking northern France and Europe to the Mediterranean area. Millions travel along its motorways in summertime from Paris to holidays at the sea. The E15 Euroroute (Britain to Spain) runs through the region. There are international airports at Lyon, Grenoble and Saint-Étienne and many other minor airports and airfields. The region is also a transport hub for the rail-network with the TGV running through Lyon from Paris and the north, to the Mediterranean. A trans-national, high-speed rail-link is projected from Lyon to Turin. Rail Numerous cities of the region Rhône-Alpes are served by TGV : The LGV Méditerranée: Marseille, Lyon Part-Dieu, Valence TGV, and Montélimar. To Paris : Lyon Part-Dieu, Valence TGV, Montélimar, Chambéry, Grenoble, Bourg Saint-Maurice, Saint-Étienne In construction, a line to the North-East: Besançon, Strasbourg and Lyon Part-Dieu) In construction, a line to Turin: Lyon Part-Dieu, Challes-les-eaux, Grenoble-Université Gières The TGV line Paris-Grenoble serves the international airport Lyon Saint-Exupéry. Every weekend in winter, Bourg-Saint-Maurice becomes one of the busiest stations in the region, when it is served by TGV trains from Paris and from Brussels, and by Eurostar from London. When a project of RER called Réseau Express de l'Aire urbaine Lyonnaise (REAL) is built, it will be the first RER of the province, the only other one being in Paris. Another RER called CEVA is planned for 2017, for the region of The leman lake (Geneva, Annemasse, Thonon-les-bains, Evian-les-bains) with extensions to La roche / foron, Annecy. Another railroad project is in realisation in Grenoble to link the suburbs. There are also tourist train lines in Rhône-Alpes (in Ardèche, in the south of Grenoble and Mont-Blanc) Road Rhône-Alpes is a major European transit hub, linking northern France and Europe to the Mediterranean area. Millions travel along its motorways in summertime from Paris to holidays at the sea. The E15 Euroroute (Britain to Spain) runs through the region. Public transport 12 transport authorities of public transport are implanted in Rhône-Alpes The Rhône-Alpes region The department of Ain The department of Isère The department of Loire The department of Rhône The department of Sytral Saint-Etienne Métropole The Port of Isère The community of Pays Viennois The community of Villefranche-sur-Saône The community of Bourg-en-Bresse The community of Grand Roanne The three largest cities of Rhône-Alpes are equipped with streetcars and have a large bus network. The largest, Lyon, has four metro lines. Lyon