U.S. Route 191, is an urge of U.S. Route 91 that has 2 branches. The northern branch presently runs for 440 miles from Loring, Montana, next to the Canadian border to the northern part of Yellowstone National Park. The southern branch presently runs for 1,465 miles (2,358 km) from the southern division of Yellowstone National Park toward Douglas, Arizona, on the Mexican border.
There is an indirect route throughout Yellowstone National Park to join the 2 branches. The highway passes throughout the states of Wyoming, Utah, & Arizona.