Caen has a recently built, controversial guided bus system—built by Bombardier Transportation and modelled on its Guided Light Transit technology—and a very efficient network of city buses, operated under the name Twisto. Faced with the residents' anger against the project, the municipality had to pursue the project with only 23% of the population in favour of the new form of transport. The road layout of the city centre was deeply transformed and the formerly traffic-jam-free centre's problems are still unresolved. The city is also connected to the rest of the Calvados département by the Bus Verts du Calvados bus network.
Caen - Carpiquet Airport is the biggest airport in Lower-Normandy considering the number of passengers that it serves every year. Most flights are operated by Brit Air and Chalair Aviation and the French national airline Air France operates three daily flights to the French city of Lyon, while in the summer there are many charter flights to Spain, the United Kingdom, Germany, Tunisia, Morocco and Algeria.
Caen is served by the small port of Ouistreham, lying at the mouth of the Caen Canal where it meets the English Channel. A ferry service operates between Portsmouth, England and Caen/Ouistreham running both standard roll-on-roll-off car ferries and supercat fast ferries, with the latter making crossing from March to November. The ferry terminal is 15 km (9.3 mi) from Caen with a daytime shuttle bus service for foot passengers.
Caen is connected to the rest of France by motorways to Paris (A13), Brittany (A84) and soon to Le Mans (A88–A28). The A13 is a toll road while the A84 is a toll-free motorway. The city is encircled by the N814 ring-road that was completed in the late 1990s. The N13 connects Caen to Cherbourg and to Paris. A section of the former N13 (Caen-Paris) is now D613 (in Calvados) following road renumbering. The N814 ring-road includes an impressive viaduct called the Viaduc de Calix that goes over the