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 arrow down forward left plate right road srtraight street traffic transport way cannon circle conflict enemy peace politics prohibitory red tank war warning wars against ban banned bicycle bicycles bike drive illegal pictogram prohibit ride stop warn wheels chinese clever knowledge letter nonsence rule rules stopped strange ting understand understandable auto bus buses busses car minibus post pylon transportation travel allowed banner canine dog dogs lace lead leash leashed dog line lined not allowed unleash unleashed dog animal no dog no dogs poop prohibition shit walking