In the 10th referendum held in 1925, Graubünden was the last canton to permit cars to drive in Rhaetia. Just four years later St. Moritz organised the first International Automobile Week.
It included a rally from various European locations to St. Moritz, a "Kilomètre lancé" on the Shell Road between Samedan and Pontresina, a precision driving contest and, the main event, a mountain race at Bernina. Well-known racing drivers such as Rudolf Caracciola, Hans Stuck, Ernst-Günther Burggaller, Prinz zu Leiningen and Graf Arco-Zinneberg took part in the event. However this mountain race along a loosely gravelled trail couldn’t cut it on the international scene and was cancelled after its second staging in 1930. Today the Alpine city’s automotive tradition lives on in the form of annual high-profile meets like the British Classic Car Meeting St. Moritz, Bernina Gran Turismo, Passione Engadina or the WinterRaid, as well as the St. Moritz Automobile Club.