I just tried the livemap to route from before to after the split....
Option 1: I-85 N, 9 min, 11 miles
Option 2: I-85 Bus N, 10 min, 10.5 miles
And the reverse:
Option 1: I-85 S, 10 min, 11.5 miles
Option 2: I-85 Bus S, 10 min, 11 miles
I was hoping to get the Business route on top to then try the beta routing engine, but oh well.