How do you stop a fire station?

We were out and about yesterday and have become more observant with some of the signs around the place. I didn’t have my camera and so went back today to get the two photos I wanted. Obviously they ran out of 4’s at the ‘4 Sale’ because that sign was gone. However the sign warning us that we might have to stop a fire station was still there. It was my daughter who noticed this one. I am so glad that they give us warning because I have no idea how to stop a fire station, let alone start one.