Construction recently has played a vital role in the economy, and is growing rapidly at almost 20% annually. As a result, Colombia is seeing a historic building boom. The Colombian government is investing heavily in transport infrastructure through a plan called "Fourth Generation Network". The target of the Colombian government is to build 7,000 km of roads for the 2016–2020 period and reduce travel times by 30% and transport costs by 20%. A toll road concession program will comprise 40 projects, and is part of a larger strategic goal to invest nearly $50bn in transport infrastructure, including: railway systems; making the Magdalena river navigable again; improving port facilities; as well as an expansion of Bogotá's airport. Long-term plans include building a national high-speed train network, to vastly improve competitiveness.