alert avoid barricade barrier build caution color cone construct construction danger direction drive equipment forbidden highway line marker marking object obstacle orange orientation pavement plastic red reflective repair road roadworks safety security sign signal site speed stop street striped stripes symbol traffic transportation travel under construction urban warning way white work atmospheric blue calm clouds countryside Great Britain horizon idyllic lake landscape loch lomond lonesome mountain mountains national park nature outlook perspective quiet reflection reflections relax relaxation romantic rural scene scenery scotland sea sketch sky view water