Castelsardo, northern Sardinia

We both have had too much sun, and I have a bit of heat rash so we had a low profile day today.  Kept in the shade by the pool till lunchtime then went for a wee drive.  Yelow roads, at least those north of Sassari towards Castelsardo, are to be avoided, but how to communicate this to our satnav ( or to the navigator ) is beyond me.  Narrow did you say?  Doesn't get near it.
Eventually emerged back onto B roads, snapped this then hightailed it back to base, only to discover some teenagers, yes, young people, were having a pool party at teatime no less, with their weird repetitive music (?)
Yelled at them in broad Anglo saxon terms.  That worked, sort of.  Going back there soon.  Wish me luck