Rolls-Royce gas fueled engines power five new ferries that went into service on two routes on the west coast of Norway in January 2007. Norway is dependent on passenger/vehicle ferries to connect sections of the road network. Deep and wide fjords cut far into the country and the new ferries provide two essential connections in the E39 highway up the west coast. Traditionally, diesel powered ferries have provided this link and the decision to use liquefied natural gas (LNG) as fuel was influenced by several factors. Because of the mountainous and difficult nature of the terrain and the long coastline, sea transport plays a much larger part in the Norwegian economy than in most countries. Exhaust gas pollution from the maritime sector is therefore a larger proportion of the total.