blur Calton city Edinburgh hill road scotland sign tram trams transport warning caution communication go highway intersection interstate light stop street street scene streets traffic traffic light traffic sign visual visual communication yield arena asphalt bike border competition line mark motobike motorbike motorcycle pavement pit lane pit walk race racetrack racing road texture sport chains compulsory heavy snow iced icy mandatory mountains roadsign roadsigns safe signs snow snow chains snow chains compulsory wheel wheels winter coctail drawing drink glass holiday party summer sun tourism touristic umbrella vacations beware black danger flake lubricity red security triangle yellow altitude boulder colorado elevation height landscape Mount Evans mountain panorama range rock Rocky Mountains usa view digger drive excavator safety travel vehicle animal sheep