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
Cumberland Mountain State Park Cumberlands Tower was originally constructed by the CCC between 1937 and 1938 using Crab Orchard Stone to house the Cumberland Homesteads offices. The tower features a water tank and a 97-step stairway to the lookout platform at the top with views of the park. The base features a museum with exhibits about the history of the Homesteads project and its residents, and period displays. Visitors can also tour an original Homesteads house which has been furnished to appear as during the Depression. Cumberland Mountain State Park Cumberland Mountain State Park is a state park in Cumberland County, Tennessee, in the