When a manufacturer or the Commissioner requires a restriction on the use of an amusement attraction, such as the age or weight of a rider, a legible sign indicating the restriction shall be posted in full view of individuals seeking admission to the amusement attraction: At the location specified by the manufacturer; At the entrance of the amusement attraction; or Close to the amusement attraction. All amusement attractions shall have a sign posted indicating the height or age restriction, or both, for that amusement attraction. Entrances to machinery rooms or restricted areas shall have a sign posted warning unauthorized persons not to enter.