Ilgaz Tunnel
Ilgaz 15 July Independence Tunnel, shortly Ilgaz Tunnel, (Ilgaz 15 Temmuz İstiklal Tüneli or Ilgaz Tüneli), is a highway tunnel through the Ilgaz Mountains between Kastamonu Province and Çankırı Province in northern Turkey. The tunnel has twin tubes of 5,370 m (17, 620 ft) and 5,391 m (17, 687 ft) in length. The tunnel was opened to traffic on December 26, 2016. The construction cost of the tunnel was budgeted to ₺ 572 million (approx. US$200 million as of March 2016). The foundation stone laying ceremony took place on November 9, 2012. Tunnel boring works were completed on April 3, 2016.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).