In Hawaii, signs are critical to trespassing law. Haw. Rev. Stat. § 708-815 defines trespassing as "...if the person enters or remains unlawfully in or upon premises after a reasonable warning or request to leave by the owner or lesssee." In this case, 'reasonable warnings' means No Trespassing: Private Property signs. The signs are made from durable aluminum and printed with 3M ink to carry messages that will last for over ten years. Note It is important to follow Hawaiian law requirements when posting these signs. 1. The signs must contain the words "Private Property", and contain letters not less than two inches in height. 2. The signs shall be placed along the boundary lines of the land and at roads and trails entering the land. They must be positioned to be clearly noticeable from outside the boundary line. Call our live Help Line if you have any questions.