from the highway crossing las americas(intl airport santo domingo) to the crossing in front of La Guerra(near Bayaguana), that's more or less the half distance, yes. it is the south part, hopefully they will finish the rest soon, i own property nera bayaguana myself, the connection to the highway(private operated, you pay a fee for the use of it) would make my travels to there from PC where i live and work much more comfortable.
have fun
Mike