Around 120 km (75 mi) from Paris, between the towns of Amiens and Saint-Quentin and near the Aire de service d'Assevillers (the largest motorway plaza in Europe), the A1 crosses over the A29. A few dozen kilometers further north it forms the southern terminus of the A2, which branches off towards Brussels. The A1 is also crossed by the A26 and the A21, and it makes up part of European routesE15, E17, and E19. At its northern terminus, the A1 turns into the A25.