Bosphorus Bridge

Bosphorus Bridge

Bosphorus Bridge (1973) in Istanbul, connecting Europe and Asia.
Coordinates 41°02′43″N 29°02′04″E / 41.04528°N 29.03444°E / 41.04528; 29.03444Coordinates: 41°02′43″N 29°02′04″E / 41.04528°N 29.03444°E / 41.04528; 29.03444
Crosses Bosphorus strait
Locale Istanbul
Characteristics
Design Suspension bridge
Material Steel
Total length 1,560 m (5,118 ft)[1]
Width 33.40 m (110 ft)[1]
Height 165 m (541 ft)[1]
Longest span 1,074 m (3,524 ft)[1]
Clearance below 64 m (210 ft)[1]
History
Designer Sir Gilbert Roberts and William Brown
Construction begin 20 February 1970
Construction end 1 June 1973
Opened 30 October 1973
Statistics
Daily traffic 200,000 [2]
Bosphorus Bridge
Location in Istanbul

The Bosphorus Bridge, also called the First Bosphorus Bridge or simply the First Bridge (Turkish: Boğaziçi Köprüsü, 1. Boğaziçi Köprüsü or Birinci Köprü), is one of two suspension bridges spanning the Bosphorus strait (Turkish: Boğaziçi) in Istanbul, Turkey; thus connecting Europe and Asia (the other one is the Fatih Sultan Mehmet Bridge, which is called the Second Bosphorus Bridge). The bridge extends between Ortaköy (in Europe) and Beylerbeyi (in Asia).

It is a gravity-anchored suspension bridge with steel towers and inclined hangers.[1] The aerodynamic deck hangs on zigzag steel cables. It is 1,560 m (5,118 ft)[1] long with a deck width of 33.40 m (110 ft).[1] The distance between the towers (main span) is 1,074 m (3,524 ft)[1] and the total height of the towers is 165 m (541 ft).[1] The clearance of the bridge from sea level is 64 m (210 ft).[1]

Upon its completion in 1973, the Bosphorus Bridge was the fourth-longest suspension bridge span in the world, and the longest outside the United States. Currently, it is the 22nd-longest suspension bridge span in the world.

Precedents and proposals

Since April 2007, a fully computerized LED lighting system of changing colours and patterns, developed by Philips, illuminates the bridge at night.

The idea of a bridge crossing the Bosphorus dates back to antiquity. For Emperor Darius I The Great of Persia (522 BC - 485 BC), as recorded by the Greek writer Herodotus in his Histories, Mandrocles of Samos once engineered a pontoon bridge across the Bosphorus, linking Asia to Europe, enabling Darius to pursue the fleeing Scythians as well as position his army in the Balkans to overwhelm Macedon.[3] The first project for a permanent bridge across the Bosphorus was proposed to Ottoman Sultan Abdul Hamid II by the Bosphorus Railroad Company in 1900, which included a rail link between the continents.[4]

Construction

The decision to build a bridge across the Bosphorus was taken in 1957 by Prime Minister Adnan Menderes. For the structural engineering work, a contract was signed with the British firm Freeman Fox & Partners in 1968. The bridge was designed by the renowned British civil engineers Sir Gilbert Roberts and William Brown, who also designed the Humber Bridge, Severn Bridge, Forth Road Bridge, Auckland Harbour Bridge and the Volta River Bridge. Construction started in February 1970 and ceremonies were attended by President Cevdet Sunay and Prime Minister Süleyman Demirel. The bridge was built by the Turkish firm Enka Construction & Industry Co. along with the co-contractors Cleveland Bridge & Engineering Company (England) and Hochtief AG (Germany). Thirty-five engineers and 400 men worked on the project.

The bridge was completed on 30 October 1973, one day after the 50th anniversary of the founding of the Republic of Turkey, and opened by President Fahri Korutürk and Prime Minister Naim Talu. The cost of the bridge was US$200 million ($1.07 billion in 2016 dollars[5]).

Upon the bridge's opening, much was made of its being the first bridge between Europe and Asia since the pontoon bridge of Xerxes in 480 BCE. That bridge, however, spanned the Hellespont (Dardanelles), some distance away from the Bosphorus, and was the second bridge after the above-mentioned bridge built by Emperor Darius I The Great across the Bosphorus in 513 BCE.

Operation

Heading towards Levent via the Bosphorus Bridge and O-1 motorway.

The bridge highway is eight lanes wide. Three standard lanes, one emergency lane and one sidewalk serve each direction.[1] On weekday mornings, most commuter traffic flows westbound to Europe, so four of the six lanes run westbound and only two eastbound. Conversely, on weekday evenings, four lanes are dedicated to eastbound traffic and two lanes, to westbound traffic.

For the first four years, pedestrians could walk over the bridge, reaching it with elevators inside the towers on both sides. No pedestrians or commercial vehicles, such as trucks, are allowed to use the bridge today.

Today, around 180,000 vehicles pass daily in both directions, with almost 85% being automobiles. On 29 December 1997, the one-billionth vehicle passed the bridge. Fully loaded, the bridge sags about 90 cm (35 in) in the middle of the span.

Aerial view of the Bosphorus Bridge

The Bosphorus Bridge is a toll bridge, and a toll plaza with 13 toll booths is situated near the bridge on the Asian side. A toll is charged for passing from Europe to Asia, but not for passing in the reverse direction.

Since 1999, some of the toll booths (#9 - #13), located to the far left as motorists approach them, are unmanned and equipped only with a remote payment system (Turkish: OGS) in order to not delay traffic. In addition to OGS, another toll pay system with special contactless smart cards (Turkish: KGS) was installed at specific toll booths in 2005.

Since 3 April 2006, toll booths accept no cash but only OGS or KGS. An OGS device or KGS card can be obtained at various stations before reaching the toll plazas of highways and bridges. In 2006 the toll was 3.00 TL or about $2.00.

Since April 2007, a fully computerized LED lighting system of changing colours and patterns, developed by Philips, illuminates the bridge at night.

In 2012, OGS and KGS were replaced with the new HGS system, which uses radio-frequency identification (RFID) technology.

History

Daytime view of the bridge

Every October, the annual Intercontinental Istanbul Eurasia Marathon crosses the bridge on its way from Asia to Europe. During the marathon, the bridge is closed to vehicular traffic.

In October, visitors participate in the 'fun run' and cross the bridge on foot. Many take picnics to enjoy the view.

The bridge was depicted on the reverse of the Turkish 1000 lira banknotes of 1978-1986.[6]

On 15 May 2005 at 7.00 a.m. local time, U.S. tennis star Venus Williams played a show game with Turkish standout İpek Şenoğlu on the bridge, the first tennis match ever played on two continents.[7][8] The event promoted the upcoming 2005 WTA Istanbul Cup and lasted five minutes.[7] After the exhibition, they both threw a tennis ball into the Bosphorus.[7][8]

On 17 July 2005 at 10.30 a.m. local time, British Formula One driver David Coulthard drove his Red Bull racing car across the bridge from the European side to the Asian side, then, after turning with a spectacular powerslide at the toll plaza, back to the European side for show.[9][10] He parked his car in the garden of Dolmabahçe Palace where his ride had started.[9][11] While crossing the bridge with his Formula 1 car, Coulthard was picked up by the automatic surveillance system and charged with a fine of 20 Euros because he passed through the toll booths without payment.[10] His team agreed to pay for him.[10]

On 5 November 2013, World No. 1 golfer Tiger Woods, visiting for the 2013 Turkish Airlines Open golf tournament held between 7 and 10 November, was brought to the bridge by helicopter and made a couple of show shots on the bridge, hitting balls from the Asian side to the European side on one side of the bridge, which was closed to traffic for about one hour.[12][13]

See also

Bosphorus Bridge on the reverse of the 1000 lira banknote (1978–1986)

Notes and references

  1. 1 2 3 4 5 6 7 8 9 10 11 12 General Directorate of Highways: Project information about the Bosphorus Bridge (Turkish)
  2. ↑ Erste Bosporusbrücke
  3. ↑ Project Gutenberg. The History of Herodotus — Volume 2 – Retrieved on 19 March 2010.
  4. ↑ 1900'deki köprü projesinde raylı sistem de vardı. Sabah. 2009-07-17 – Retrieved on 19 March 2010. (Turkish)
  5. ↑ "Consumer Price Index (estimate) 1800–". Federal Reserve Bank of Minneapolis. Retrieved November 10, 2015.
  6. ↑ Central Bank of the Republic of Turkey. Banknote Museum: 6. Emission Group - One Thousand Turkish Lira - I. Series, II. Series, III. Series. – Retrieved on 20 April 2009.
  7. 1 2 3 "Venus Williams' match stretches two continents". Hürriyet. 2005-05-15. Retrieved 2009-06-25.
  8. 1 2 "Venus Williams Plays Tennis on Bosphorus Bridge in Istanbul". Argus Photo Ltd. Retrieved 2009-06-25.
  9. 1 2 "Coulthard smokes 'em over Bosphorus". Motoring. 2005-07-18. Retrieved 2009-06-25.
  10. 1 2 3 "Bridge too far for Coulthard". BBC. 2005-07-26. Retrieved 2009-06-25.
  11. ↑ "F1: 2005 Turkish GP". Motorsport. 2005-07-17. Retrieved 2009-06-25.
  12. ↑ "Tiger Woods takes shot at Bosporus Bridge". Dünya. 2013-11-06. Retrieved 2013-11-06.
  13. ↑ Çoban, Cengiz & Ümit Türk, Ramazan Almaçayır, Dilhun Gençdal, Yaşar Kaçmaz (2013-11-06). "Tiger Woods hits ball on Bosphorus Bridge". dha. Retrieved 2013-11-06.

External links

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