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TableĀ 4 Speech messages and their meanings

From: User-centered design of a depth data based obstacle detection and avoidance system for the visually impaired

Speech message Meaning
Left and right are free Free paths exist on both the left and the right in front of the user
Left is free Free path exists only on the left in front of the user
Right is free Free path exists only on the right in front of the user
Stop, no free path No free path on the left, right, or middle in front of the user (dead end)