Every road connects to another. It's still it's own road, no? Those addresses would say BOYLSTON AVE wouldn't they?
I know the layout of the town decently well and I have studied the maps for her routes for several hours.
There are a couple of other places where an abduction could have been possible, but none seem any better than where she was found. And when considering where she started from, the window of opportunity time wise, her final location, and the fact that no one saw her on Worcester RD. ( so many people drive down this road that it would be common knowledge by now if someone saw her on that road and that road would also have become a focal point of the investigation because it would point toward someone coming in from out of town, I believe). If I have to rate the relative probabilities of which road she was picked up on, it would go BSR, BOYLSTON AVE, ALLEN HILL, MOUNTAIN ROAD. I think that BSR leads the pack by a significant margin. Though BOYLSTON AVE near the BSR intersection also seems possible to me.
Disclaimer- I understand we have not heard all of the 1000 tips and there is some chance that she was on another road and that has been told to the police. But we have initial witnesses putting her on BSR. if initial witnesses also put her on Worcester Road, my feeling is that we would have heard that initially when we heard about the other tips regarding her being seen.