"board_type"=>"history","information"=>"board"
"ref:NBd"=>"00003/001","operator"=>"Gemeente Menterwolde","information"=>"guidepost","traffic_sign"=>"NL:K6"
"map_size"=>"site","map_type"=>"street","information"=>"map"
"map_size"=>"site","map_type"=>"street","information"=>"map"