When driving on mountain roads during daytime, you should: When driving on mountain roads during daytime, you should:

• A. blow your horn every 15 seconds
• B. blow your horn whenever you sense an incoming vehicle
• C. blow your horn when approaching a blind curve
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  The correct answer is C

   

  It's not mandatory but blowing your horn is always a good measure and a safe way to approach and drive through a curve especially on a mountain.