What does this sign indicate?

• Vehicles taller than the height shown on the sign should not enter.
  Explanation:

  "This sign provides a warning about a height restriction ahead, such as an overpass, bridge, or tunnel. Vehicles that exceed the specified height should avoid entering to prevent damage or accidents."
• The road ahead has a steep incline.
• The height of the overhead structure ahead is unrestricted.
• All vehicles must stop and measure their height before proceeding.