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2 directions = An angle of convexity for a field of vision of approximately 90° used at a junctions where users are coming from 2 different directions. |
3 directions = An angle of convexity for a field of vision of approximately 180° used at junctions where users are coming from 3 different directions. |
4 directions = An angle of convexity for a field of vision of approximately 360° suspended at junctions where users are coming from 4 different directions. |