The Sariyer-Cayirbasi Tunnel construction, which is the third one of the ''7 Hills 7 Tunnels Project'' of the Istanbul Metropolitan Municipality, has been completed by Plaket Insaat as this company was set up in partnership with our Group Company of Seckin Insaat and Oztas Insaat and its official opening has been performed at 8th of September 2012, Saturday with the participation of the Prime Minister of Turkey, Mr. Recep Tayyip Erdogan. 

The Sariyer-Cayirbasi tunnel will ease the traffic density in the region to a considerable extent the distance between Haciosman descent and Kilyos Street will be shortened by 40% and the time to travel this distance will be reduced from 1 hour to 5 minutes. 

Each of the tunnels, which will relieve the traffic on the coastal road by connecting the people who live at regions of Sarıyer, Kilyos and Zekeriyakoy, with the main arterial roads without driving through the centre of the county, have 2.1 km of length and they have been constructed with two lanes.