What does a diamond-shaped sign with a yellow center and white border signify (Znak 'Put sa prvenstvom prolaza' / Priority Road sign)?

1. You are on a priority road and have right-of-way over intersecting side roads until an end-of-priority sign appears
2. You must yield priority to all side-street traffic
3. Caution: dangerous road surface with loose gravel ahead
4. All traffic must turn right at the next intersection