of Europe's fastest-growing companies in the field of computer games (the developer of Top Eleven Football Manager, a game played by over 20 million people). Tourism The touristic sector accounted for 1.4% of GDP in 2017 and employs some 75,000 people, about 3% of the country's workforce. Foreign exchange earnings from tourism in 2018 were estimated at $1.5 billion. Serbia is not a mass-tourism destination but nevertheless has a diverse range of touristic products. In 2018, total of over 3.4 million tourists were recorded in accommodations, of which half were foreign. Tourism is mainly focused on the mountains and spas of the country, which are mostly visited by domestic tourists, as well as Belgrade which is preferred choice of foreign tourists. The most famous mountain resorts are Kopaonik, Stara Planina, and Zlatibor. There are also many spas in Serbia, the biggest of which is Vrnjačka Banja, Soko Banja, and Banja Koviljača. City-break and conference tourism is developed in Belgrade (which was visited by 938,448 foreign tourists in 2018, more than a half of all international visits to the country) and to a lesser degree Novi Sad. Other touristic products that Serbia offer are natural wonders like Đavolja varoš, Christian pilgrimage to the many Orthodox monasteries across the country and the river cruising along the Danube. There are several internationally popular music festivals held in Serbia, such as EXIT (with 25–30,000 foreign visitors coming from 60 countries) and the Guča trumpet festival. Transport Serbia has a strategic transportation location since the country's backbone, Morava Valley, represents by far the easiest route of land travel from continental Europe to Asia Minor and the Near East. Serbian road network carries the bulk of traffic in the country. Total length of roads is 45,419 km of which 915 km are "class-Ia state roads" (i.e. motorways); 4,481 km are "class-Ib state roads" (national roads); 10,941 km are "class-II state roads" (regional roads) and 23,780 km are "municipal roads". The road network, except for the most of class-Ia roads, are of comparatively high quality to the Western European standards because of huge financial investments Serbias has been seeing in the last 10 years. Over 300 kilometers of new motorways has been constructed in the last decade and additional 142 kilometers are currently under construction: A5 motorway (from north of Kruševac to Čačak) and 30 km-long segment of A2 (between Čačak and Požega). Coach transport is very