 The final extension occurred on October 1, 1945, when the highway was extended south down US-283 to Cheyenne, then west to the Texas state line.SH-33 and SH-47 swapped places west of US-283 on July 9, 1956; SH-47 proceeded due west of Roll to the Texas state line, while SH-33 passed through Cheyenne and turned toward the west south of there.This gave both highways straighter courses and resolved the wrong-way concurrency.