Tires stuck in the floors, what is the use?

While playing I sometimes encounter tires half buried into the floor. Curiously mostly on buildings, or other places where you would not expect tires.

I can activate them to 'open'. But that does not seem to do anything.

It looks like this:

And this happens after activation:

(So, nothing, disregard the different location, 2 different screenshots)

Does anybody know what it does?