blue bridge bridges bus car cross crossing dundee estuary lamppost lorry perspective pier pillar river road scotland sea span Tay transport travel van water cantilever Edinburgh engineering fence foreground Forth girder girders iron mesh metal rail railway scottish ship tanker train trains barge build building cassion concrete construction crane dam Firth landmark steel suspension tall tower countryside disused exercise footpath green line Mawddach natural nature path peaceful refreshing shadow sunlight track trail tranquil trees view wales walk welsh bank boat dinghy England estuarine fitful foreshore grass Great Britain Hampshire landscape low marine maritime mast mood moody mudflat pole storm stormy tide weather yacht yachting forest