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
Allamuchy Mountain State Park Mountain land became part of Allamuchy Mountain State Park. Tranquillity Farms, on the other side of the highway, remains a privately operated commercial farm. Locally, the ruins of the Rutherfurd-Stuyvesant Estate have become known as "Profanity House" because many of the buildings and ruins have been vandalized and covered in explicit and sexually graphic graffiti. In recent years, the estate has suffered from arson damage. Allamuchy Mountain State Park Allamuchy Mountain State Park is located in Byram Township, New Jersey in the Allamuchy Mountain region. The park is operated and maintained by the New Jersey Division of Parks and Forestry.