If you come from the N860 you have a really nice section of straights and twisty curves going down to the dam (Barrage de Nisramont) Make a stop there to enjoy the dam. You can walk on the dam or doing a trail allong the lake. After if you take the Ortho way after the first few curves going up you will have 200 meter of really bad asphalt. Be carefull after. After that enjoy the rest of the road more in the middles of fields