Gubrist Tunnel

The Nordring in Zurich is a bottle­neck. A quarter of Switzerland’s overall con­ges­tion hours occur on this 10 km stretch. The A1 ex­pansion of the Zurich northern by­pass from four to six lanes is de­signed to eliminate the chronic bottle­neck. In addition to the con­struc­tion of the third tube of the Gubrist Tunnel, the Marti Gubrist consortium has worked on various sub­projects along the entire route.