clean clean up compulsory green litter man mandatory Mandatory sign no litter no trash no waste roadsign roadsigns sign signs trash trash can UP waste environment rubbish stencil Bin floating garbage Nyberg pool sailing water basket Dustbin toss building can dust house windows isolated trashcan cat cats coons kitten kittens maine pet young animals prohibited appropriate behavior appropriate behaviour bicycles prohibited black black and white communicating communication denial denied dog informing littering prohibited no animals no bicycles no littering not allowed not permitted permission denied prohibited prohibition prohibitions rules warning white autumn bench hay straw blue colour container cutout