Ya sorry I always get it mixed up with the % grade thing.
When I'm in my car the dash reads on the hills here between 12° all the way up to 16° on the switchback into the valley. The new market is up a 14° hill.
So closer to ~24% grade average maybe? It's damn steep is the point regardless.
So the steepest roads in the world have small sections where the grade exceeds 30%; none maintain it or "average" 30%.