I am sure this has been discussed but I have not had time to reread all 14 threads for this case. It looks like, after looking at the accident scene etc. And accounting for the turn that Maura would have been heading in the direction one would travel if they were going back toward interstate 93 which would be a primary route back to Massachusetts.
It seems looking at a map without being familiar with the area, one might presume that getting off 93 and taking 112 across to 302 would be feasible if heading for Burlington Vermont.
Also, I am not sure about the serial killer, particularly a serial killer from out of the area, makes a lot of sense. It is a pretty remote place to be hanging out waiting for the right victim to happen along. Now if he lived in the immediate area, that would make some sense. I think it was either a spur of the moment decision to abduct Maura or she left the scene under her own power ( which I believe is more likely of the two).
One last question. Ralph Leon Jackson. Has he been tied to any other crimes, aside from the double shooting on the BRP? I have found nothing linking him to anything else. Just wondering as I see his name coming up in many threads.