STRÖMMA KANAL Traffic signal at the entrances of the canal: Fl Y Stand by outside the entrance. Bridge signals: Iso R 4s Bridge is closed. Iso R 4s + Iso W 4s Signal acknowledged. Iso R 4s + F W Bridge about to be opened. Iso G 4s Bridge open - proceed. Opening hours after prior notification to the bridge master. Contact details: www.sjofartsverket.se Opening is available 5 minutes past each full and half hour. 1 May - 31 May and 1 Sep - 15 Oct: 0905 - 1205, 1305 - 1535 1 Jun - 31 Aug: 0905 - 1205, 1305 - 1535 and 1805 - 2005 16 Oct - 30 Apr: Bridge closed.