Premise: U.S. Highway 61/190 Business (BUS US 61/190, officially 61-X) is a state highway in Louisiana that serves East Baton Rouge Parish. It spans 10.89 mi in a southeast to northwest direction and it is bannered as Business 61/190, with no directional shields. It generally follows the 1940s-1950s alignment of US 61/190 through Baton Rouge.
Hypothesis: 61-X was built before the 1940s.