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Article 10: Definitions 340 Section 10.1: Definitions Traffic Generation: High Uses which generate an average of more than 800 vehicle trips per day. Transmission Lines a) For lines carrying electrical energy, transmission lines are those which carry 45,000 volts or more. b) For lines which carry liquids or gases, transmission lines are those operating or designed to operate at pressures of one hundred pounds per square inch or greater. Travel Trailer A structure that is: a) Intended to be transported over the streets and highways (either as a motor vehicle or attached to or hauled by a motor vehicle), and b) Designed for temporary use as sleeping quarters, but that does not meet the definition of a manufactured home. Tree, DBH Diameter at breast height of a tree, which is measured at 4.5 feet above ground surface level. Tree, Critical Root Zone The minimum area beneath a tree which must be left undisturbed in order to preserve a sufficient root mass to give a tree a reasonable chance of survival. The critical root zone is approximately one foot of radial distance for every inch of tree's DBH, with a minimum of eight feet. Tree, High Value A tree that meets or exceeds the following standards: for pine species, 14" DBH or greater, or 18" or greater stump diameter, and for hardwood or wetland species, 16" DBH or greater, or 24" or greater stump diameter. Trip Generation Rates The total count of trips to and from a study site per unit of land use as measured by parameters such as dwelling units, acres, etc. Twenty-Year Transition Land''—" Land designated in the Comprehensive Plan as being located in areas that are in the process of changing from rural to urban, that are suitable for urban-type densities and should be provided with public utilities and services within the second 10-year phase of the Comprehensive Plan. Upward In the context of outdoor lighting, the projection of light above the horizontal plane. Urban Designated Land that is located within a Transition Area as identified in the Land Use Element of the Comprehensive Plan and also within a Primary Service Area as defined by the Water and Sewer Management Planning and the Boundary Agreement and Map adopted December 3, 2001 and as either may be amended from time to time. Utility Lines and Line Equipment The local distribution system of public utilities and community systems which include electricity, telephone, water, sewage disposal, and cable television. These systems are for local distribution of services and are not intended to be used for transmission or as trunk lines for utilities. Distribution systems for electrical system shall not exceed 45,000 volts; the distribution system for liquids or gases are those operating at pressure of less than 100 pounds per square inch. 17 Staff is suggesting that it be more clear that this type of designation comes from the Comprehensive Plan. Orange County, North Carolina—Unified Development Ordinance Page 10-64