Can also depend on the length of the route. There was one infamous MS tour where a section was in bad shape. Apparently the road was supposed to be repaved before the tour, but wasn't. Painted on the road was:

Now
Begins
7 miles
of
HELL

And they weren't kidding. Some things can't be helped.

So can you find alternative routing by pouring over maps? May only use part of the "newly improved" section?