abstract appearance autumn autumn-colors autumn-colours autumnal background brittle brown color colored colorful colors colour coloured colourful colours contrasts dark death deciduous dry dying edge edges exotic fall golden leaf light maroon nature orange red russet rust rusty seasons shapes sunlight texture textures variations veins yellow yellowish alert appropriate-behavior appropriate-behaviour arrow black blue care communicating communication concern danger dangerous denied directions disapproval disapproved information informing no-standing not-allowed not-permitted permission-denied prohibited prohibition prohibitions protect protection restricted restrictions risks risky roadside rules safety sign signs sun-rays sunlit symbols warning warning-sign white