Originally Posted by
You want to go where?
This is not exactly correct. There are two RER stops at CDG. There is one at Terminal Two which is walkable from some of the sub-terminals but not all.
The RER stop that is labeled Terminal 1 is near but not at Terminal 1. It is directly connected to the Terminal by the CDGVal airport driverless train service as etch5895 has indicated. You do not have to go to Terminal 2.
This is good to know-I haven't used the driverless train yet.
From a user's perspective I think the key question is: Is there clear signage on the RER so that a user knows where to get off for Terminal 1, and is there clear signage from where you get off so that a user can see how to get to and use the train?