Since 2002, regional train services have ended at Bardonecchia; previously they crossed the border through the tunnel to Modane. This is to allow the enlargement of the tunnel to allow the passage of container trains. Now only TGV trains reach Modane from Italy. Instead of regional trains, there is a replacement bus service to carry passengers to Modane, although this is a limited service. Freight traffic is still well supported. In particular, special freight trains constitute the Alpine rolling road. Low flat wagons carry trucks through the Alps. These trains are fitted with a passenger carriage for the transport of truck drivers. Four pairs of daily trips each day connect Turin Orbassano goods yard and the French terminal at Aiton at the bottom of the Maurienne Valley.