Highways create their own traffic because they attract commercial and residential development along their corridor.
This is supposed to be a toll road. I doubt that traffic will ramp up as expected for many moons. Just look at the ICC in Maryland - they were originally hoping for a weekday count of 50K to 70K users, but instead get 30K on the western part and 20K on the eastern part, and claim that it is about what they expected (memory holes, anyone?).