Túnel de Occidente, Transportation tunnel in Medellín, Colombia

The Túnel de Occidente, officially Túnel Fernando Gómez Martínez, is a 4.6-kilometre road tunnel between Medellín and San Jerónimo. It is the third-largest tunnel structure in Latin America, with control rooms at each end, 800 lamps, 220 kilometres of electrical wiring and fire-suppression tanks holding 142,000 litres.

The tunnel was inaugurated on 20 January 2006, after eight years of construction that generated about a thousand direct jobs. Its total cost was 325 billion pesos, with Invías contributing 220 billion (61 percent) and the Metropolitan Area of Medellín and the Antioquia Governorate the remaining 39 percent. Ten million cubic metres of earth were moved, and the electromechanical equipment alone required 20 billion pesos.

The tunnel links Medellín's urban center to colonial towns in the west, making it easier for people to visit family, shop, and travel between different ways of living. This connection has changed how residents move between city and countryside.

The tunnel operates continuously for vehicle traffic and connects two major routes. Expect heavier traffic during rush hours, particularly in early morning and late afternoon when commuters are traveling.

The tunnel is 4.6 km long and, when it opened, was described as the third-largest tunnel structure in Latin America. Its control rooms at each end manage over 50 television cameras and around 800 lamps, and can reach drivers on the 106.9 MHz radio frequency, which works only inside the tunnel.