 The section in Durham County (0.03 miles in length) is designated SR 2397 while the section is Orange County (0.08 miles in length) is designated SR 1604.The exception to this rule applies to roads designated SR10xx (where the x's represent additional digits) which are generally given to regionally significant roads or roads crossing one or more county lines, but which are not part of the primary system.For example, SR 1006-Old Stage Road, is located both in Wake and Harnett counties.