What should you be aware of in case of blocked or narrow roads ahead?

• Be aware that you might feel sleepy driving so slowly.
• Be aware that the vehicle ahead might stop or reduce speed unexpectedly.
  Explanation:

  "Be aware that the vehicle ahead of you may stop or reduce speed unexpectedly to view the scene."
• Be aware that the driver in front of you might feel sleepy driving so slowly.
• Just keep driving at the speed you are driving.