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
Suicide in South Korea also graded on a curve, leading to more competition. Since 2012, students in South Korea go to school from Monday to Friday, and every odd Saturday. Before 2005, South Korean students went to school every day from Monday to Saturday. Although South Korean education consistently ranks near the top in international academic assessments such as PISA, the enormous stress and pressure on its students is considered by many to constitute child abuse. It has been blamed for high suicide rates in South Korea among those aged 10–19. In South Korea, mental illness is taboo, even within a family. Over 90%