payment is required while passing from Asia to Europe.) Since April 2008, cash payments are no longer accepted, having been replaced by a remote payment system. In addition to OGS, the contactless smart sticker HGS system is in use. An OGS device or HGS sticker can be obtained at various stations before the toll plaza of highways and bridges. Since late 2019 the toll is 10.50 TRY (currently about 1.40 USD). The tolls for Istanbul bridges increase every 20 months or so by tens of percent to keep up with high inflation. See also Çanakkale 1915 Bridge Eurasia Tunnel, undersea tunnel, crossing the Bosphorus for vehicular traffic, opened in December 2016. Great Istanbul Tunnel, a proposed three-level road-rail undersea tunnel. Osman Gazi Bridge Marmaray, undersea rail tunnel connecting the Asian and European sides of Istanbul. Public transport in Istanbul Rail transport in Turkey Turkish Straits References Design and Construction Stages of Fatih Sultan Mehmed Bridge, ITU External links Google aerial image of bridge 3D-model ″Fatih Sultan Mehmet Bridge″ for Google Earth Bosphorus crossings Bridges completed in 1988 Bridges in Istanbul Mehmed the Conqueror Road bridges in Turkey Suspension bridges in Turkey Toll bridges in Turkey 1988 establishments in Turkey