Explore details about location Outer Hwy 18 South. Outer Hwy 18 South is a location situated within the Apple Valley alongside other areas such as Titonka Road, Outer Hwy 18 South, Sunset Drive. Additionally, some smaller parts of Outer Hwy 18 South include specific areas like Outer Hwy 18 North, Yaqui Road, Mandan Road adding to the diversity of its landscape.