AMP: 0 Location: Howie Rd and US-191, Sweet Grass Cty No reassurance shield as S-478 begins. AMP: 2 Location: Howie Rd and Rapelje Rd, Sweet Grass Cty Two miles into the route, turn left to stay on S-478/Rapelje Rd. Pavement ends at the turn. AMP: 2 Location: Rapelje Rd and Howie Rd, Sweet Grass Cty No reassurance shield … Continue reading Montana Secondary Highway 478, US-191 to Stephens Hill Rd