The South Dakota Department of Transportation is proposing amendments to the following rules: 70:01:02:00 – Interstate highways speed zone rule; and 70:01:02:27 – Fall River County Speed Zone rule. The South Dakota Transportation Commission will be considering changes to the speed limit on Interstate Highway 90 in and around Sioux Falls and on U.S. Highway 385 in Hot Springs. The purpose of the proposed rule changes is to enhance safety.