60 (reckoned from Klagenfurt), was also sometimes a test stretch of the automobile manufacturer, Porsche, produced after the Second World War in nearby Gmünd in Carinthia, because of its high demands on automobiles. In January 1978, Audi presented the newly developed Audi Quattro to the company leadership on the Turracher Höhe, where the performance of the new all-wheel drive could be convincingly demonstrated on the steep, curvy and snowy road of the pass. The pass road has a maximum gradient of "only" 23% today on a short section on the Carinthian side. It is well cleared in the winter and only has to be closed very rarely. Economy and infrastructure The dominant branch of the economy on the Turracher Höhe today is tourism. Besides hotels, inns and ski lift operations, as well as a few small shops and the mineral museum, no businesses are based here. After mining was stopped in the 20th century, the timber industry and forestry are the only "traditional" branch of business still existing on the Turracher Höhe, aside from a few small agricultural operations. Lumber and forestry There are still large expanses of woodlands in the Mura valley and in the region between Predlitz and the Turracher Höhe even today in family ownership, which come from the lands acquired by the House of Schwarzenberg in 1623. They are managed by the "Fürstlich Schwarzenberg'schen Familienstiftung" (Prince Schwarzenberg Family Foundation). The area managed by the forest administration in Turrach in the region of the municipality of Predlitz-Turrach is 8,411 ha in total, of which 5,804 ha are commercial forest and barrier woodlands, as well as 2,607 ha of Alpine and miscellaneous areas at an altitude between 930 and 2,434 metre above sea level. The trees felled by the forest administration of Turrach amount to around 24,000 solid cubic metres (or stères) per year, of which 79% is from clearcutting and 21% is from selection cutting. The woodlands on the southern side of the Turracher Höhe are also privately owned for the most part; 90% of the entire forest land of the municipality of Reichenau is distributed over plots of land of under 200 ha. The yield is mostly sold as logs; there are no sawmills or other wood processing operations in the immediate vicinity of the Turracher Höhe. Water supply Drinking water is supplied from two springs near the Grün Lake and a further one from Kornock.