Stone Mountain Freeway Gwinnett County and have a partial interchange with Park Place Boulevard and Rockbridge Road. Just to the east of this interchange, the freeway ends and US 78/SR 10 continue to the east, locally known as Stone Mountain Highway. West of I-285, the speed limit is . East of the interchange with I-285, the limit rises to . Unlike Georgia's Interstate highways, the highway still has actual sequential exit numbers, rather than being mileage-based. There is no exit 6, which makes the exit numbering non-sequential. All of Stone Mountain Freeway is included as part of the National Highway System, a system
Indian Mountain State Park a marshy floodplain approximately wide. Jellico occupies the northeastern part of this plain, and extends up the slopes of the valley's northernmost hills. Indian Mountain State Park occupies the northwestern half of the valley between Jellico and the base of Indian Mountain. Elk Creek splits Indian Mountain State Park into eastern and western halves. The western half is dominated by the Indian Mountain Lake, which spans the base of Indian Mountain and forms the southern and western boundary of the park's campground. Ballard Lake, a large pond slightly smaller than Indian Mountain Lake, dominates the park's eastern section. Several smaller