The road crosses the Pays de Bray then by-pass the town of Beauvais.
The old N 31 (now D 931) skirts the Forêt du Parc Saint-Quentin before entering Beauvais.
The road leaves the town to the north east through the Forêt de Compiègne along the banks of the river Aisne.
The road continues to follow the Aisne and then the river Vesle to the south east.
The road finally ends in Valmy, west of Sainte-Menehould joining the N 3.