Generally revise the route of the Lewis and Clark Highway

This bill revises the route of Montana's Lewis and Clark Highway specifically through Missoula, changing the path between South Higgins Avenue and Arthur Avenue north of 6th Street. It prohibits the highway from running through that residential area and requires the transportation department, with input from Missoula County and the city, to identify an alternate route that avoids residential neighborhoods. The rest of the highway route - connecting Idaho to Lolo, then to Missoula via U.S. Highway 93, and continuing east to North Dakota - remains unchanged. The bill directly affects Missoula residents in the affected neighborhoods and transportation planning officials.