Live Chat I-90 Community Nearby Traffic US 18 SD 2024-05-02 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to US 18 SD Gregory, SD 12.06 Herrick, SD 16.39 Saint Charles, SD 19.02 Interstate highway exits close to US 18 SD Exit 272, i90 63.14 Exit 265, i90 64.61 Exit 284, i90 66.28 Interstate highways close to US 18 SD i90 map 63.14 i29 map 201.68 i229sd map 204.22 State roads close to US 18 SD US 18 SD map 1.61 NE 12 map 29.89 US 183 SD map 34.89