Under Erdoğan's government, the number of airports in Turkey increased from 26 to 50. Between the founding of the Republic of Turkey in 1923 and 2002, there had been 6,000 km of dual carriageway roads created. Between 2002 and 2011, another 13,500 km of expressway were built. Due to these measures, the number of motor accidents fell by 50 percent. For the first time in Turkish history, high speed railway lines were constructed, and the country's high-speed train service began in 2009. In 8 years, 1,076 km of railway were built and 5,449 km of railway renewed. The construction of Marmaray, an undersea rail tunnel under the Bosphorus strait, started in 2004. It was inaugurated on the 90th anniversary of the Turkish Republic 29 October 2013. The inauguration of the Yavuz Sultan Selim Bridge, the third bridge over the Bosphorus, was on 26 August 2016.