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121 <br /> trend towards smaller household sizes. In 1970, the Census <br /> reported that the average household in Hillsborough Township <br /> had 3.41 persons. By 1980, that figure had dropped to 2.66 <br /> persons. <br /> Circulation <br /> The County's major east/west and north/south transportation <br /> routes intersect in Hillsborough Township, making it a <br /> • <br /> • central point in the County transportation network. The <br /> east/west corridor consists of I-85, US70, and the Southern <br /> Railroad. The north/south system consists of two State <br /> • Highways, NC86 and NC57, along with two important local <br /> roads, Old NC86 (SR1009) and Orange Grove Road (SR1006) . Upon <br /> completion, 1-40 will link up with 1-85 just west of Town. <br /> A modified version of the North Carolina Highway Functional <br /> Classification System is used to describe the road network in <br /> Orange County. The system describes segments of the road <br /> network based on mobility and access factors. The most <br /> important roads, Interstates and arterial highways, provide <br /> the best level of service as measured in travel time to and <br /> from major activity centers. Roads of lesser importance, <br /> collector roads, do not provide as high a level of service, <br /> but do provide areas with access to major roads and secondary <br /> access to activity centers. Local roads provide the most <br /> limited service capacity, but, in the aggregate, provide <br /> large land areas with access to more important roads and <br /> highways. <br /> Interstates 40 and 85 are designated as interstates, while <br /> five roads in the township are classified as arterial roads; <br /> US70 and its Bypass, NC86, NC57, Old NC86, and St. Mary's <br /> • Road (SR1002) . St. Mary's Road angles northeast out of <br /> Hillsborough and provides a major route between Hillsborough <br /> and northern Orange County. Orange Grove Road (SR1006) and <br /> Old NC10 (SR1710) are classified as collector roads. All <br /> other roads provide a local level of service. <br /> The objective of any component of a transportation system, <br /> such as a street or highway, is to accommodate a specific <br /> amount of traffic while providing the operator with an <br /> acceptable level of service. A level of service 'C' is <br /> frequently used as an appropriate criterion for highway and <br /> street design purposes and is defined by the North Carolina <br /> Department of Transportation as a zone of stable flow with <br /> speed and maneuverability more closely controlled by higher <br /> volumes. Levels of service range from 'A, ' which is a <br /> 3.9-4 <br />