The Glion Tunnel is a two-gallery vehicular tunnel running underneath Montreux

Montreux

Montreux is a municipality in the district of Riviera-Pays-d'Enhaut in the canton of Vaud in Switzerland.It is located on Lake Geneva at the foot of the Alps and has a population, , of and nearly 90,000 in the agglomeration.- History :...

 in Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. It carries autoroute A9

A9 motorway (Switzerland)

The A9 motorway, an Autobahn in western Switzerland, is a divided highway connecting from Ballaigues to southwestern Switzerland. It is part of the National Road N9....

, which links the Vaud

Vaud

Vaud is one of the 26 cantons of Switzerland and is located in Romandy, the French-speaking southwestern part of the country. The capital is Lausanne. The name of the Canton in Switzerland's other languages are Vaud in Italian , Waadt in German , and Vad in Romansh.-History:Along the lakes,...

 canton to the Valais

Valais

The Valais is one of the 26 cantons of Switzerland in the southwestern part of the country, around the valley of the Rhône from its headwaters to Lake Geneva, separating the Pennine Alps from the Bernese Alps. The canton is one of the drier parts of Switzerland in its central Rhône valley...

, and was placed in service in November 1970. The tunnel is 1350 metres (4,429.1 ft) long, 9 metres (29.5 ft) wide and 7.5 metres (24.6 ft) high.

Between 1970 and 2000, traffic through the tunnel increased from 8,800 vehicles per day to 50,000, with 80,000 vehicles per day at times.

Renovations

During 2004-2005 the tunnels were renovated to bring them into conformity with the recommendations of the Tunnel Task Force, whose report was published in May 2000. The old tunnels were dark and did not conform to modern safety standards. Work was performed on one tunnel at a time, with traffic diverted through the other gallery. The construction resulted in major delays.

Source

• This article incorporates text translated from the corresponding French Wikipedia article as of January 11, 2011.