A12 Motorway (Switzerland) - Route

Route

The A12 travels from the junction of the A9 La Veyre on a plateau (500 m above sea level) over Vevey. During the first 5.5 kilometres (3.4 mi), the highway rises along the eastern flank of the Veveyse up to 820 metres (2,690 ft) above sea level and forms a sharp S-curve. This highway section, with an average gradient of 5.8% (and maximum gradients over 6%), is one of the steepest stretches of motorway in the Swiss national road network. After the ascent portion, the canyon of Veveyse de Fégire is crossed by a bridge. Once reaching the plateau of Haute Veveyse, at the foot of the Alps, the road has only small differences in height. The culminating point is located, at an altitude of 866 metres (2,841 ft) above sea level, at Weiler Prayoud northeast of Chatel-Saint-Denis. Here are the main European watershed between the Rhone with the catchment area of the Veveyse, and passes the Rhine (with the catchment areas of Broye and Sarine).

At a length of 15 kilometres (9.3 mi), the A12 now runs at an altitude of about 800 metres (2,600 ft) above sea level, before it reaches the Gruyère region and the basin of bull. It then runs between the reservoir Lac de la Gruyère and the heights of the Gibloux to the north. At Gumefens and Avry-devant-Pont there are two Tagbau-tunnels. North of the latter is the most important building of the A12, the approximately 2-km long Viaduc du Lac de la Gruyère, constructed during the years 1974-1979 in a sweeping curve to the western valley side, spanning two short arms of the Lac de la Gruyère.

Afterwards, the highway enters the Molasse plateau of Freiburg Plateau, tackling in several stages a height difference of just over 100 metres (330 ft). After the bridge over the Glâne, the agglomeration of Freiburg in the west and northwest is bypassed through hilly terrain, known before (with another bridge over the Schiffenensee and Pont de la Madeleine, in line to the little hermitage in the sandstone cliffs near the highway bridge), and thus the Sarine gulch crosses the German/French language border.

As a result, the corridor runs through the little reliefs plateau at Düdingen and Wünnewil. With a bridge at Flamatt, which has a gradient of 4%, the road leaves the plateau and reaches the valley of the Sense (river). Thereafter, the A12 runs through the relatively densely populated and industrial and commercial buildings lined Wangental valley, to the western border of the city of Bern. Following is the Southern Bypass of the district Bümpliz, with an almost 1-kilometre (0.62 mi) long bridge crossing the plateau, before the highway ends at the junction Weyermannshaus into the A1.

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