Why is it unsafe to drive behind a log hauling truck when it is turning left or right?

• It is not unsafe to drive behind them.
• When these trucks are turning, the logs can fall off and hurt someone.
• When these trucks are turning, the logs can block all or some of the lanes of the highway.
  Explanation:

  "It is unsafe to drive behind a log hauling truck when it is turning left or right because the logs can block all or some of the lanes on the highway."
• None of the above.