An international competition will be launched next month to choose the team to design and construct Mumbai's 22.5km Trans Harbour Link Bridge. The four lane highway will be India's longest sea link, connecting South Mumbai to Nhava in Navi Mumbai. It will cross the harbour in spans of 50m to 150m at a typical elevation of 12m, except for three navigation spans with 25m clearances. These three are envisaged as using a precast post-tensioned extradosed segmental box girder deck system with single layer central cable stays.