This door slides on rails affixed to the exterior of the building.
But, I'll bet they work just fine. And they really look nice all worn and weathered. Now this reminds me of my own garage door. It's not in great shape either. The door has four panels that I must open and fold back manually. If the car is in the garage (mostly in winter), the chore of opening the doors to get it out really makes me think twice about going anywhere.
This door swings open. Both doors have "no parking" signs on them.
And once the car is out, I have to go back and close the doors behind me. Then, naturally, I have to repeat the process in reverse when I get home. I really have to want, or need, to go out in the winter.