text: You are allowed to acces from the west side. You are just not allowed to pass over the bridge up to the village Ljusterbro.
  
  The sign says "Gäller genomfart" which means you can pass the sign, but not use the road to go to a location further away, like Ljusterbro.
  
  A dashed road is just a way to represent a track on Openstreetmap. It has nothing to do with legal access. I did change the access tag slightly, and removed the vehicle=destination from the west road.