No, if it were just the incline it'd be no problem... it connects just to the south to a 21% grade road that's well traveled by bikes and cars and small trucks.
It's also very narrow... a small car and a bicycle can not pass without the bicyclist stopping and leaning against the side of the heavy grass/slope that lines the road. I know this from experience. (But on the other hand, cars are very rare there.)
But the worst aspect is the road surface. Like I said, I've done a 32% road before, and it wasn't well paved, but it was so much easier than this road, which is perpetually covered in a slimy layer of wet moss and small pebbles. I have not had the guts to even try it while clipped in. (But just earlier today, I had no issues with a clean, well-paved 25% grade not far away.)
Any pedestrians going this general direction are mountain hikers and this road is much preferable compared to the well-trafficked curvy road to the east. But it would be best if vehicles are never routed on this road unless they explicitly ask.
It's almost to the point that it might be better, practically speaking, to classify it as an "Unmaintained Track Road".