S.R.I - the Spiral Ring Interchange
Congestion is growing in cities, but space for full road interchanges is scarce or super-expensive. The Spiral Ring Interchange has the most efficient area utilization due to:  its geometry - a spiral construction, where entrances are on different sides of the ring than the exits; and  due to the option of using the inner space for parking and public transportation, thusly reducing traffic congestion. This opens a new market for building full interchanges in dense urban areas.
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