 The only portion of SR 75 that is part of the National Highway System, a system of routes determined to be the most important for the nation's economy, mobility, and defense, is the entire length of the US 76/SR 2 concurrency.The original southern terminus was at Georgia State Route 254 near the Mossy Creek and Skitt Mountain Golf Courses.This segment ran northwest into US 129/SR 11 and multiplexed with those routes until it reached Helen Way.