What does this sign on a vehicle indicate?

• The vehicle is authorized to exceed speed limits.
• The vehicle is moving at highway speed.
• The vehicle is moving at a slow speed, typically 40 km/hr or less.
  Explanation:

  "The Slow-Moving Vehicle sign is used to indicate that the vehicle displaying the sign is moving at a slow speed, typically 40 km/hr or less. Drivers should be prepared to adjust their speed accordingly and exercise caution when approaching such vehicles."
• The vehicle is temporarily parked on the road.