| A35 at French border|
The A3 is a motorway in northeast Switzerland, running diagonally from France toward the southeast border, and passing by Zurich on the way. The total length of the A3 motorway spans roughly 180 kilometres (110 mi), but parts of the road share sections of the A1 and A2 motorways.
The A3 belongs to the Swiss motorway network. It starts at the border in Basel, where it connects to French motorway A35. From the Wiese Motorway Fork, the route is shared with the A2.
At Augst, the motorway splits, with the A2 branching off and the A3 continuing past Rheinfelden and Frick. After the Bözberg tunnel is the Birrfeld Motorway Fork, near Birmenstorf. Here, the A1 and A3 share the same route as far as Motorway Interchange Limmattal, where the A3 goes towards Urdorf and the Uetliberg Tunnel which was opened on May 4, 2009. After Zurich the motorway weaves through the hills of the south-east bank of Lake Zurich. It continues along the Walensee (Walen Lake), and on to Mels where it ends at a junction with the A13.
The A3 represents (together with a section of the A1) the most important connection between Basel and Zurich, and (together with a section of the A13) the most important connection Zurich–Chur.
A3 motorway (Switzerland) Wikipedia
A special feature is the highway section at Lake Walen. Between Weesen and Murg in 1964, the N3 center was opened as a main road and led by the six tunnels: Ofenegg (370 metres or 1,210 feet), Weisswand (1,100 metres or 3,600 feet), Standenhorn (460 metres or 1,510 feet), Glattwand (160 metres or 520 feet), Mühlehorn (300 metres or 980 feet), and Stutz (180 metres or 590 feet).
The highway section has been extended since 1986 with the opening of the Kerenzerberg Tunnel (5.76 kilometres or 3.58 miles), which handles the road to Murg / Sargans. The old six tunnels and the road on the shores of Lake Walen were converted to unidirectional operation and now form the carriageway to Weesen / Zurich.
Since May 4, 2009, with the opening of the highway section between the port Birmensdorf and Zurich, the branch South- the last section of the so-called "Western Bypass" - the A3 motorway is continuous between Basel and Sargans.
With the opening to traffic of the new section on May 4, two existing sections of highway have been renumbered. The leader in the city of Zurich Autobahnast Limmattal - Hardturm (always officially recorded as N1) is now known as A1 (Switzerland) or A1H (Shuttle Hardturm) rather than A3. The leading out of town Autobahnast Wiedikon - Zurich south, the so-called Sihlhochstrasse is referred to as the new A3W (feeder Wiedikon).
Also initiated, with the opening of the Western Bypass, the first stage of the flanking measures pass the residential areas along the former "West tangent" in the city of Zurich. The existing road trains, which were used for urban transit highway connection endpoints and Wiedikon Hardturm, were temporarily contracted on May 2, each for one traffic lane in each direction. In the following months until the summer of 2010, dismantling will continue of the "temporary" transit routes to district roads (West Street and Sihlfeldstrasse) and urban main roads (Seebahnstrasse und Schimmelstrasse)). In addition to various structural measures that are placed on the axis of incidence via Wollishofen and Albisrieden, additional traffic lights are used to regulate traffic flow in the metering equipment and make the side-traffic into the residential neighborhoods unattractive.