The major portion of construction of the roundabout at the intersection of State Route 28 and 13th Avenue SW began on Monday, causing traffic backups in all four directions. The state highway, also known as F Street SW in Quincy, was reduced to a single lane. Officials encourage drivers to avoid the intersection. Traffic passing through Quincy can bypass the city by using White Trail Road. In-town drivers can avoid the intersection by using Road 11 NW to the north or Road 9 NW to the south. Tommer Construction is the contractor on the project, which will continue into summer.