The pictures I found of r440 near palivuk where Bjorn turned around look like gravel of the rougher kind. If the pictures are accurate my guess is he decided that he didn't feel like doing more distance on this road.
https://www.tripadvisor.co.uk/ShowTopic-g294449-i6233-k10074656-Driving_in_Bosnia_advice-Bosnia_and_Herzegovina.html
@c.h.e. started
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The pictures I found of r440 near palivuk where Bjorn turned around look like gravel of the rougher kind.
If the pictures are accurate my guess is he decided that he didn't feel like doing more distance on this road.