The road runs in a generally northwesterly direction from the junction of Zirl-Ost (ca. m (AA)) on the Inn Valley Autobahn (the A 12), initially heading east and then north past Zirl (622 m), where it runs over the south and east flanks of the Zirler Berg (1,057 m) with a maximum gradient of 16% and only one hairpin bend; there it is also known as the Zirlerbergstraße. It then runs through Leithen (1,009 m) to Reith (1,130 m), which it passes to the east.