The Bubenholz Tunnel is a motorway tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 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....

, and forms part of the A51 motorway around Zurich Airport.

The tunnel is around 600 metres long.

The tunnel replaces several overpasses which existed until the early 2000s. It is also supposed to cut noise from the motorway away from the nearby towns of Glattbrugg and Opfikon

Opfikon

Opfikon is the name of a municipality in the Swiss canton of Zurich, located in the district of Bülach.-Coat of arms:Blazon: Party per fess gules and argent, in chief a half length portrait of a man wearing a coat sable with a white collar, in base cross pattee sable.-Geography:Opfikon is situated...

.

, the tunnel is only partially complete and only portions of the tunnel are open to traffic.