Île-de-France Mobilités (STIF) – This site provides comprehensive information on RER and bus schedules in the Île-de-France region.
Car Access
From Paris:
Via N118 (Pont de Sèvres): Take the N118 from Pont de Sèvres, and exit at Exit 9 for « Centres universitaires, Grandes écoles. »
From Porte d’Orléans: Take the A6 towards Lyon, then merge onto the A10 towards « Nantes/Bordeaux. » Exit on the left towards « D444/Versailles/Igny/Bièvres » and continue on the D36.
From Paris Airports:
From Paris-Charles de Gaulle (CDG): Take the A1 towards Paris, then merge onto the Périphérique extérieur (outer ring road) towards Rouen at Porte de la Chapelle. At Porte de St-Cloud, follow the N10 towards « Bordeaux/Nantes » and then the route via N118.
From Paris-Orly (ORY): Take the N7 towards Paris, then merge onto the A86 towards Versailles. Exit at Exit 30 for « A6/A10/Bièvres/Igny/Bordeaux/Nantes. » Continue on the A10 towards « Nantes/Bordeaux » and exit on the left for « D444/Versailles/Igny/Bièvres, » then continue on the D36.