Temporary off-premises directional sign: a temporary sign erected by a business, agency, organization or development located within the Township that directs vehicular traffic to an establishment, event, activity, product or service not sold, produced or available on the property on which the sign is located, including but not limited to real estate open houses, garage sales, estate sales, weddings, showers, picnics, concerts, special promotions and similar events, but not including any public signs, as defined herein, that are exempt from these regulations.