sentences:  In 1940 US 287 was extended south into Texas, and a stretch from Fort Worth northwest to Bowie was cosigned with US 81.The summer 1941 "Texas Highway Map" shows this pairing, and the current southern terminus of US 81 is still cosigned with US 287.The spring and summer 1949 "Texas Highway Department Official Map" designates the length of US 81 from Laredo to Fort Worth as part of the National System of Interstate Highways, but no numeric designation was given at the time.