Transport in Monaco is facilitated with road, air, rail, and water networks. Rail transportation is operated by SNCF and its total length is 1.7 km. Monaco has five bus routes operated by Compagnie des Autobus de Monaco. There are also two other bus routes which connect Monaco with neighboring regions such as Nice and Menton. There are six bus routes in Monaco, all operated by Compagnie des Autobus de Monaco (CAM).There are 143 bus stops through the Principality. There is no airport in the Principality of Monaco. The closest airport is Cote d'Azur Airport in Nice, France, which is connected to Monaco by the Express 110 bus. Monaco has 50 km of urban roads which provide access to the A8 autoroute. Monaco buries its highways so that traffic flow can be improved and so more land is available.