What was the key difference between the early acoustic signals for the blind and the 1939 'Walk/Don't Walk' neon signs for the general public?
Answer
The 'Walk/Don't Walk' signs provided explicit, textual information.
The 1939 signs in Washington, D.C., provided explicit, textual information ('Walk'), which was an evolution beyond the permissive color signals or the basic audio cues used previously.
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