crossing railway sign bar barrier cutout fence isolated rail railroad Railway crossing roadsign roadsigns signs warning advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful caution communicating communication concern danger dangerous directions informing looking lookout observant railway-station railway-tracks red risk risks safety trains warning-sign watch watch-out white lamp train x hexagon pictogram security track transport yellow estuary gantry indicator ladder Mawddach river Signals view wales water welsh cars listen Look rails railway-crossing road broken cross old railways rusty stop weird drive groove rut street traffic travel vehicle directing direction directional directive Dirt dirty railway-sign road-sign traffic-flow warning-lights weathered blue pole post posts set signpost signposts sky steel