Design Considerations for US 50 / SR28 Trumpet Interchange

by Robert W. Byren, TESA Tech Team

We suggest that a “trumpet” interchange at the Spooner Summit interchange, with SR20 passing under US 50, may be a better alternative to the roundabout.  It is technically feasible at this location  and provides several advantages over the 3-leg large-scale roundabout proposed in the CMP:

·      Free-flow of traffic on US 50

·      Improved automobile and truck turn movements in all directions, minimizing wait time

·      No weaving (lane change) movements, thus avoiding certain accident types

·      Improved bicycle safety by eliminating crossing movements

·      Improved evacuation operations with no roadway reconfiguration

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