STH 61 and Jamaica Ave. Roundabouts
Cottage Grove, MN
MTJ Roundabout Engineering provided peer review and geometric services for the final operational/capacity analysis, laneage requirements, and final horizontal geometrics optimization for this complex system of roundabout interchanges.
MTJ’s work effort included analysis of the 6-leg roundabout versus two closely-spaced roundabouts, and was one of the first interchange roundabouts in the state of Minnesota.
- Flared entry
- Spiral design
- Accommodates large trucks