What does this sign mean?

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

  "This sign alerts drivers that a fire station or fire truck entrance is located ahead, and fire trucks may be entering the roadway from the mentioned side. Drivers should reduce speed, remain alert, and be prepared to yield to emergency vehicles."
• Fire trucks are prohibited from entering the road.
• Only emergency vehicles are allowed on this road.
• Drivers must turn off their engines and wait for fire trucks to pass.