Drogowa Trasa Średnicowa (DTŚ, can be translated as diametral highway or central highway) is a highway in Silesian Voivodeship, Poland. The DTŚ is entirely a divided highway, with a minimum of 3 lanes in each direction. It is one of the most important roads of the Upper Silesian Industrial Region. The DTŚ runs most of its course parallel to A4 motorway but, unlike A4, the DTŚ provides access to the congested centers of the Upper Silesian Metropolitan Union with 26 junctions (A4 has 6 junctions in the comparable section).