The thing about Huron River Drive (actually there's a couple) is:
1.) Lots of bikers/joggers, especially on the weekends. Runs alongside of Hudson Mills Metropark for awhile and gets a lot of overflow from there.
2.) Fairly busy traffic-wise on the weekends.
Don't get me wrong, it's a fun-as-all-hell road (growing up out there gave me a lot of drive time on it), it's just too clogged up these days. Plus it's 35mph the entire length and fairly heavily patrolled because of it.
I'll talk to WorldTour and get some other back roads into that route from Compuware to Hell... you can go around the east and south sides of Portage Lake. There's construction in downtown Pinckney anyway so it'll give you a chance to get around that as well.