Route nationale 1

The road heads into the Foret Dominiale de L'Isle-Adam where the A16 autoroute starts, and then crosses the River Oise.

In Amiens the road turns north west along the Somme valley past the memorial Samara.

The road rises again reaching 134 m above sea level north of the town which offers views over the Parc Naturel Regional caps et Marais D'Opale.

The road passes through the village of Samer before turning north west to the major port and historic town of Boulogne-sur-Mer.

The A16 autoroute passes round the town with the Eurotunnel terminal and heading north to the Belgium frontier and takes the majority of through traffic.

After the town the road is numbered the RN 1 and it passes a series of refineries and other industrial complexes in the Zone industrielle Portuaire.

The road then enters the port of Dunkerque where the RN 225 (European Route E 42) heads south east to Lille.