Special routes of U.S. Route 18
Wikimedia list article
At least eight special routes of U.S. Route 18 (US 18) have existed.
Hot Springs bypass route
U.S. Highway 18 Bypass (US 18 Byp.) is a bypass around the Hot Springs, South Dakota, city center. It begins on the west side of Hot Springs at an intersection with US 18 and travels in a southeasterly direction. The highway skirts the western and southern edges of the city and meets South Dakota Highway 71 close to the point where the route turns east. It ends at US 18/US 385 in the southeastern corner of the city.
Hot Springs truck route
Mason City business loop
U.S. Highway 18 Business (US 18 Bus.) begins at a diamond interchange with Interstate 35 (I-35) on the eastern edge of Clear Lake, Iowa. The route, overlapped by Iowa Highway 122 (Iowa 122), begins as a four-lane divided highway, serving the Mason City Municipal Airport before entering Mason City proper. Between Eisenhower and Jefferson avenues in Mason City, the highway is undivided. This road is the primary east–west artery through Mason City. At Jefferson Avenue, US 18 Bus./Iowa 122 separate into a pair of one-way streets, remaining in this configuration through the downtown area where the Park Inn Hotel, one of Frank Lloyd Wright's few commercial buildings, resides.
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