The Pyrhn Pass between the provinces of Upper Austria and Styria and the Tauern Pass between the High Tauern range and the Lower Tauern range of the Central Alps in Salzburg, provide access to the Mur Valley in Styria and the Drau Valley in Carinthia, respectively. The highways that run through these passes are important northwest–southeast lines of communication through the Alps. The Pyrhn highway has been nicknamed the "Fremdarbeiterweg" ("foreign workers' route") because millions of "Gastarbeiter" ("guest workers") in Germany use it to return to their homes in the Balkans and Turkey for vacation. Many Germans and northern Europeans also use it in the summer months to reach the Adriatic coast. After the outbreak of hostilities in Yugoslavia in the summer of 1991, however, a substantial amount of this traffic was re-routed through the Danube Valley and Hungary.