Work is set to begin on a roundabout at the intersection of Montana Highway 3 and Zimmerman Trail on Monday, July 16th, and the road is already closed for about one mile of reconstruction. The two projects combined are projected to cost over $8 million. The Zimmerman Trail work will widen the existing roadway, improve drainage, signage and an updated guardrail. Four accidents occurred at that intersection in 2015 and 12 in 2017.