Had a great time. Some interesting oncoming traffic about 25 miles in from the start in Jordan Valley...Semi's pulling stock trailers (I'd never seen a stock trailer with a pup trailer attached) in sections where the road was maybe a lane and a half, but more than sufficient pullouts...
No traction issues as long as you remember pea gravel on the road is similar to ice in many ways
For the remainder of the trip, virtually zero traffic w/ exception of a couple of Owyhee county road graders.
If you're in SW Idaho it's an easy and very beautiful trip.