I finally tried driving the road up to the Tryvann tower. It finishes with 6.5 kilometres with 400 meters vertical ascent. The last 3.5 kilometres is continous uphill. It’s a great reward to enjoy the descent after doing all that work.
The best thing is that I live so close to the road that it makes an overall drive of 20 kilometres. A perfect exercise after a long workday. Next time I’m going to drive against the clock 🙂