Practice question

What does a circular white road sign with a red border and a black silhouette of a horn crossed by a red diagonal line indicate?

  1. Prohibition of acoustic signals (Proibição de Sinais Sonoros / C17): honking the horn is forbidden except in imminent danger
  2. Acoustic signal mandatory zone
  3. Musical entertainment venue ahead
  4. Hearing test clinic zone

Answer: A — Prohibition of acoustic signals (Proibição de Sinais Sonoros / C17): honking the horn is forbidden except in imminent danger

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