sentences:  It was not until 1959 that parts of US 81 in Texas appeared on the "Texas Official Highway Travel Map" cosigned with I-35 shields.Succeeding maps reflect the slow completion of I-35 and I-35W over the stretch of US 81 between Laredo and Fort Worth, with the 1978-79 "Texas Official Highway Travel Map" showing only a section from Encinal north to south of Artesia Wells as incomplete, and the 1980 "Texas Official Highway Travel Map" shows that section completed.In 1980, US 81 was cosigned with I-35 and I-35W except where the Interstate bypassed towns; US 81 provided the main route through town and then reconnected with I-35 on the other side.