I-69W and I-69E will merge just south of Victoria, Texas, where mainline I-69 will follow US 59 northeast to Fort Bend County. In the Houston area, I-69 follows US 59 (Southwest Freeway) from Fort Bend County to the west loop of I-610. I-69 then follows US 59 (Eastex Freeway) from the north loop of I-610 to the Liberty-Montgomery county line. The segment of US 59 inside Loop I-610, through downtown Houston, was approved for designation as I-69 by the FHWA on March 9, 2015 and approved for signage as I-69 by the Texas Transportation Commission on March 25, 2015.