Sharing a Very Narrow Road — a stop on the Tunnel of Trees.
A practical stretch, because this road has an unusual mix of users and the geometry is unforgiving.
M-119 is a famous cycling route. It is beautiful, it is rolling, and it has no shoulder whatsoever — so cyclists ride in the lane, because there is nowhere else to be. When you come up behind one, you will need to cross the centerline to pass, except that through the tunnel section there is no centerline and often no sight line either. So: wait. Wait until you can see properly. It will cost you thirty seconds.
The same applies to the pull-offs. Several of them are barely a car wide and open directly onto a blind bend. Signal early, get fully off the pavement, and when you leave, look twice — a cyclist coming downhill here is doing thirty miles an hour and is invisible until he is on you.
Deer are the other one. This is heavy deer country, the woods come right to the edge, and dawn and dusk are the dangerous hours. A deer standing in dappled shade on this road is genuinely hard to see.
None of this is a reason not to drive it. It is a reason to drive it at twenty-five, which is the speed the road is best at anyway.