 The structure has a mass of 82,000 tonnes and supports two railway tracks beneath four road lanes in a horizontal girder extending along the entire length of the bridge.On both approaches to the three cable-stayed bridge sections, the girder is supported every by concrete piers.The two pairs of free-standing cable-supporting towers are high allowing shipping of head room under the main span, but most ships' captains prefer to pass through the unobstructed Drogden Strait above the Drogden Tunnel.