sentences:  US 81 at its inception in 1926 followed the route of State Highway 2 (SH 2), which began in Laredo and passed through San Antonio, Austin, Waco, and Fort Worth before passing over the Red River into Oklahoma north of Ringgold.The 1936 "Official Map of the Highway System of Texas" clearly shows the route labeled both as US 81 and SH 2.It was cosigned with US 83 for from Laredo to south of Webb, with US 79 for from Austin north to Round Rock, and with US 77 for from Waco to Hillsboro.