From Paris : to La Défense after Cergy-Pontoise by the motorway A15. Exit 5 Herblay/Beauchamp (1). Follow the direction to Beauchamp/Taverny on the cross road de la Patte d'Oie by the Av. de la Libération, on first light traffic turn on the right. From Cergy-Pontoise : follow the motorway A15 to Paris until the exit 5 Herblay/Beauchamp (2). RER Ligne C station Montigny-Beauchamp (3). 7mn à pied.