Expressway S2 Tunnel

The Expressway S2 Tunnel in Warsaw (Tunel drogi ekspresowej S2 w Warszawie) or Ursynów Tunnel (Tunel pod Ursynowem) is a highway tunnel, part of the S2 expressway in Warsaw.

The tunnel opened on December 20, 2021.

As of end of 2021, the tunnel is the longest road tunnel in Poland. From the west, the tunnel entry begins at Węzeł Ursynów Zachód junction. In the east, the tunnel joins the Węzeł Ursynów Wschód junction.

Specifications
The tunnel is around 2330 meters in length (some sources claim 2335 meters in length), and crosses underneath the preexisting tunnel of the Warsaw Metro Line M1. Each of the two roadways has a width of 14.5 meters, with three traffic lanes each, and a hard shoulder 3.75 meters in width. Each roadway has a 1-meter wide emergency path.