Practice question

What makes a red octagonal sign recognizable even before you can read the word on it?

  1. All warning signs are red octagons
  2. Its unique eight-sided shape and red color identify it as a stop sign
  3. It is the same shape as a railroad advance warning sign
  4. It always has a blue service panel attached

Answer: B — Its unique eight-sided shape and red color identify it as a stop sign

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