Why should you exercise caution when you see large vehicles backing up?

• Large vehicles do not have efficient brakes.
• Large vehicles have large blind spots.
  Explanation:

  "Large vehicles, such as trucks or buses, have substantial blind spots, especially when backing up. This makes it difficult for drivers to see nearby pedestrians, cyclists, or other vehicles."
• Large vehicles do not have side mirrors.
• Large vehicles do not have rear mirrors.