What does this sign mean?

• There is an upcoming fire truck entrance from the mentioned side of the road.
  Explanation:

  "This road sign is used to inform drivers that there is an entrance for fire trucks onto the road from the direction indicated by the sign. It alerts drivers to be cautious and prepared to yield the right of way to fire trucks entering or exiting the roadway."
• There's a parking area for commercial vehicles ahead.
• Long vehicles are prohibited in the area.
• There is a construction zone ahead.