To further clarify. When going from CircleK parking to Kurši, there is a traffic sign 301. (Iebraukt aizliegts) with the additional 849. traffic sign "izņemot ar xxx atļaujām". 

I think the same combination of signs exist when going from Kurši to CircleK, but I'm not 100% sure.

If it would be better I can take a picture next time I'm there.