US Highway 277 / US Highway 377

US Highway 277 goes through only Texas and Oklahoma. It starts westward from US 83 in Carrizo Springs, TX. It travels through Eagle Pass and Del Rio before heading north. It crosses Interstate 10 at Sonora, then goes through downtown San Angelo. From San Angelo, US 277 continues north to Abilene where it carries traffic on the west side of the city. Wichita Falls, TX sees US 277 cosigned with I-44. In Oklahoma, US 277 meanders northeast to Newcastle (southwest of Oklahoma City) where it ends at I-44 exit 107.

US Highway 377 is in only Texas and Oklahoma. It begins in Del Rio, TX at the intersection of Gibbs Street and Avenue F. It runs north via Avenue F (US 90/US 277). US 377 splits from US 277 almost 27 miles later. It crosses Interstate 10, then goes through Mason, Brady, and Brownwood. Heading northeast, US 377 carries high traffic from Granbury through Fort Worth. After going through Denton, TX, it crosses into Oklahoma and through Madill, OK. OK 99 is cosigned with US 377 the entire route of US 377 in Oklahoma. After Madill, they go through Ada and end in Stroud at OK 66.