The O-3 Highway, also known as the O-3, is a major roadway in South Korea. It connects the cities of Seoul and Incheon, facilitating efficient transportation between these urban centers. The highway is part of the country's extensive road network, designed to support both local and regional travel. Opened in the early 2000s, the O-3 Highway features multiple lanes and modern infrastructure, enhancing traffic flow and safety. It plays a crucial role in the economic development of the Incheon Free Economic Zone and serves as a vital link for commuters and commercial vehicles alike.