Originally Posted by
Zero
^ Hmmmmm, when there is a number on the ark, it opens one of the doors in the ark dimension, that allows coming in and out. Basically, Allen gives one of the doors a standard destination, with can later be used. On the other hand, when there is an "?" mark, it means that it's only a one way door, that will will disapear after passing through (that's why the ark shatters). It's possible that one destination may not be ever usable, after ark being shattered.
Road dissapeared before ? Damn, had forgotten about that ;P(though, did it look the same way ? I tought that she just turns in to a doll.). Now that I think about Road's powers, it seems to be a prototype of the arc, or more of a advanced version, with own mind and will ?