Golden Center Freeway / McKnight Way Interchange

Grass Valley, CA

MTJ Roundabout Engineering’s Mark Johnson was the designer/reviewer responsible for operational analysis and final horizontal geometrics for this roundabout serving a major interstate.

This challenging roundabout project includes two 6-leg interchange ramp terminal roundabouts.

Key to this effort was developing a design that was sensitive to ROW impacts, existing infrastructure and business access, while ensuring safety and access for all modes of travel.

MTJ’s extensive roundabout design experience played a pivotal role in achieving the correct roundabout design solution for this application of two roundabouts.


  • Closely spaced existing frontage road
  • Evaluated feasibility of 6-leg roundabout vs. two closely spaced roundabouts
  • Constrained urban context
  • Utilization of existing bridge structure

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