Transport in South Korea roads and various classifications below the national level. Almost all freeways are toll highways and most of the expressways are built, maintained and operated by Korea Expressway Corporation (KEC). The freeway network serves most parts of South Korea. Tolls are collected using an electronic toll collection system. KEC also operates service amenities (dining and service facilities) en route. There are also several privately financed toll roads. Nonsan-Cheonan Expressway, Daegu-Busan Expressway, Incheon International Airport Expressway, Seoul-Chuncheon Expressway and parts of the Seoul Ring Expressway are wholly privately funded and operated BOT concessions. Donghae Expressway was built in cooperation between KEC and
Multicultural family in South Korea also includes the families of foreign workers, North Korean refugee families, and ethnic Korean families moving to Korea. The first category, international marriage families, refers to a family consisting of a married Korean citizen and a foreign spouse. The second category, the families of foreign workers, includes those that foreign workers bring with them to Korea or new families formed by foreign workers in Korea. Most of those families include children. The third category, North Korean refugee families, is composed of residents from North Korea with the official registration. These people have left North Korean society with various motives. In