N1 (France)

The N1 is a Route Nationale in France. Historically, it has run north from Paris towards Calais via Beauvais, Abbeville and Boulogne, with a later diversion via Amiens.

The road was derived from Napoleon's Routes Imperiales; he gave the road the first number as it was the principal route the French army would take to invade Britain in the Napoleonic Wars. In 1973, the road was extended over the former N40 towards the Belgian border east of Dunquerque. Since then, most of the road has been downgraded and replaced by the Autoroute A16; the only remaining part still classified N1 is the Amiens northern bypass.