Rapid urbanization, a sharp increase in registered vehicles which was disproportionate to road expansion and heavy social cost from traffic congestion and accident are the main catalysts for South Korea’s Intelligent Transportation Systems (ITS) adoption after the 1970s and full implementation around 2000. The objectives and substantial achievements of the ITS are in reducing congestion, enhancing road safety and decreasing environmental pollution. Strategic and legal framework that facilitate the rollout of the ITS includes master plans, new legislation, standardization effort and pilot programs. The comprehensive approach between technological solution and strong legal framework contributes to the success of delivering nationwide positive impact on transportation.