We spoke with the company responsible for the road from Rogla to Klopni vrh and we were allowed to use the road on own responsibility. The road is OK to drive with 2 places where some extra care is needed. One organizer will be there at the barrier at Koča na Pesku (mountain hut on the way, 2km from Rogla) for more information.
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If you still want to use detour (from Rogla: 66km, 1h35min): link.