Erikssundsbron (Swing bridge) The bridge is remotely operated from the Stäket bridge. For contact information and opening hours, visit: www.sjofartsverket.se Bridge signals: Iso R 3s Bridge is closed. Iso R 3s + Iso W 3s Signal acknowledged. Iso R 3s + F W Bridge about to be opened. FR + Iso W 3s Give way to oncoming vessel. Iso G 3s Bridge open - proceed. FR + FW Bridge cannot be opened.