revised the proposal to the current configuration in February 1971, and it was approved by the FHWA that March. I-180 opened in June 1984, after six years of expressway upgrades. Major intersections References External links I-180 at AARoads I-180 at Interstate-Guide 80-1 Wyoming 80-1 1 Wyoming Transportation in Cheyenne, Wyoming Transportation in Laramie County, Wyoming