The Sozina Tunnel is a road tunnel in Montenegro that is a part of the M-1.1 highway. It is located north of Sutomore and south of Virpazar, and is designed to bypass the "Paštrovska Gora" mountain range that separates the Montenegrin coast from the Zeta plain and the Skadar Lake basin. The Sozina road tunnel is 4,189 m long, and is the longest and most modern vehicular tunnel in Montenegro. It was opened on 13 July 2005, coinciding with Montenegro's national day. It was built at a cost of 70 million euros. Since 15 July 2005 a toll is collected at the tunnel entrance, using an open toll system.