What does this sign mean?

• The vehicle is carrying a hazardous material load.
• The vehicle is carrying an oversized or wide load.
  Explanation:

  "This sign is displayed on vehicles carrying loads wider than normal road lanes, such as construction materials, prefabricated homes, or heavy machinery. It alerts other road users to be cautious when passing or overtaking and to allow extra space."
• The vehicle's load is unusually tall.
• The vehicle is transporting a heavy load.