sentences:  Original plans for the route included a potential overlap with the "TTC-35" corridor component as well, but the preferred alternative for that component follows I-35 south of San Antonio instead of entering the lower Rio Grande Valley.Since July 2011, Texas has been proceeding with upgrading rural sections of US 59, US 77, and US 281 to interstate standards by replacing intersections with interchanges, and converting two-lane stretches to four lanes by adding a second carriageway to the existing roadway.A stated goal of TxDOT's I-69 initiative is that "existing suitable freeway sections of the proposed system be designated as I-69 as soon as possible".