chains compulsory heavy snow iced icy mandatory mountains road roadsign roadsigns safe sign signs snow snow chains snow chains compulsory warning wheel wheels winter car highlands narrow passing place scotland signpost single track vehicle cars go lights safety signal signs full stop stop Stop light street alert animal black dog groningen guard guard-dog pet shape vector white access-denied access-limited advice appropriate-behavior appropriate-behaviour ban banned be-careful beware bylaws communicating communication concern danger dangerous denied directions information informing law legal motorbikes-prohibited no-wheels not-allowed not-permitted pedestrian-care pedestrian-safety permission-denied prohibited prohibition prohibitions restricted restriction restrictions risk risks rules symbol warning-sign watch watch-out appropriate behavior appropriate behaviour directing direction directional directive give way indication indicator road sign street sign traffic traffic flow boulders green hazard Lofoten Islands nature norway norwegian red roadside rockfalls sheep summer triangle triangular announcement bicycles-prohibited dead end street end hidden its all over no way out over road rules sackgasse street yield sign the end traffic sign way avalanche beach caution cliffs cornwall England english falls Great Britain grunge grungy rock sand stand