 The tunnel is slightly below ground level and is partially covered at first when entering the tunnel, it later becomes fully underground before the junction of Chin Swee Road, Clemenceau Avenue, Upper Cross Street and Havelock Road.From Upper Cross Street, before leaving the Central Business District, there is an entrance to the tunnel northbound to Seletar Expressway.On Havelock Road, there is an exit from the direction towards the south, where there is an ERP gantry before going on the main road.