The autoroutes of France are a series of motorways that consist of a number of toll roads – often signalled by blue and white sign of a two lane road and a bridge along with the phrase 'Peage'.
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Main roads in France, designated Route Nationale or “N” roads, can be acceptable for long journeys as an alternative to toll roads. Of course you can't travel as fast, but they are often straight and un-crowded and are a nice alternative to monotonous toll roads. Minor roads are classed as 'D' roads.
Roads are classified into the following categories: Axxx: autoroute (Motorway/freeway) (red number sign) Nxxx: national road (red number sign; sometimes referred to as RNxx) Dxxx: departmental road (yellow number sign; sometimes referred to as RDxx or CDxx)