Dolmabahçe–Bomonti Tunnel

The Dolmabahçe–Bomonti Tunnel (Turkish: Dolmabahçe–Bomonti Tüneli) is a twin-tube road tunnel under the inner city of Istanbul, Turkey connecting the neighborhood of Dolmabahçe in Beşiktaş district and Bomonti in Şişli district. Opened in 2010, it is 2,360–2,390 m (7,740–7,840 ft) long and under 40 m (130 ft) underground.

Dolmabahçe–Bomonti Tunnel
Dolmabahçe–Bomonti Tüneli

Overview
Location	Dolmabahçe, Beşiktaş – Bomonti, Şişli (Istanbul, Turkey)
Coordinates	41.04193°N 28.99298°E / 41.04193; 28.99298 41.05854°N 28.97642°E / 41.05854; 28.97642
Operation
Work begun	2007
Opened	14 June 2010 (2010-06-14)
Owner	Istanbul Metropolitan Municipality
Traffic	automotive
Technical
Length	2,360–2,390 m (7,740–7,840 ft)
No. of lanes	2x2
Operating speed	70 km/h (43 mph)

Dolmabahçe

Bomonti

Location of Dolmabahçe–Bomonti Tunnel in Istanbul

The tunnel is part of a project of the Istanbul Metropolitan Municipality to build seven tunnels for the "City of Seven Hills", which is the nickname of Istanbul. It was opened on 14 June 2010 as the second tunnel of this project following the Kağıthane-Piyalepaşa Tunnel after a construction time of three years. Its southeast entry is situated north of the BJK İnönü Stadium in Dolmabahçe. It runs under the neighborhoods Taksim and Feriköy. The northwest entry is located in Bomonti. The two independent tubes with two lanes each are 2,360 m (1.47 mi) and 2,390 m (1.49 mi) long. The tunnel is linked with the Kağıthane-Piyalepaşa Tunnel over a connection road of 500–600 m (1,600–2,000 ft) between Bomonti and Piyalepaşa.[1]

By using both tunnels, the driving time between Dolmabahçe and Kağıthane during rush hours drops from 45 to 5 minutes at a driving speed of about 70 km/h (43 mph).[2]