TRAFFIC SEPARATION SCHEME AND DW ROUTE AT HATTER BARN The traffic separation scheme at Hatter Barn shall be used in accordance with Rule 10 of the International Regulations for Preventing Collisions at Sea. The traffic lanes in the traffic separation scheme have a minimum depth of 15 metres and shall be used by ships with a draught not exceeding 13 metres. The 19 metres DW Route between Hatterrev and Hatter Barn is intended for use only by ships with a draught of more than 13 metres.