There is a sign for "No agricultural machinery or bicycles" at 
https://www.mapillary.com/app/?pKey=234514445099582
(and the same sign in westbound direction, https://www.mapillary.com/app/?pKey=381333979915579&focus=photo)

Whether that's sufficient to signify a "trunk", I'm not sure. But the whole Y-krak, including roundabouts, should have the same classification (trunk or primary). 