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
Chaebol lines were critical. In the 1950s and early 1960s, chaebol concentrated on wigs and textiles; by the mid-1970s and 1980s, heavy, defense, and chemical industries had become predominant. While these activities were important in the early 1990s, real growth was occurring in the electronics and high-technology industries. The chaebol also were responsible for turning the trade deficit in 1985 to a trade surplus in 1986. The current account balance, however, fell from more than US$14 billion in 1988 to US$5 billion in 1989. The chaebol continued their explosive growth in export markets in the 1980s. By the late 1980s, the