The « CDGVAL » is a free automated light rail metro service that connects all the car parks and stations at Paris Charles de Gaulle airport. The CDGVAL also links the terminals and takes you to all the public zones at Paris CDG. The train runs every 4 mins from 4am to 1am and every 20 minutes between 1.30am and 4.30am
You can catch the CDGVAL at terminals 1, 2 and 3. Just follow the signs for « CDGVAL ». Travel time between the terminals 1, 2, and 3 and between the PR and PX car parks takes from 2 to 10 mins depending on where you want to go.