It is so you don't blast car exhaust into an open window. I lived in a place where you could park literally right front of the building all that separated the front of the apartment and the parking lot was a sidewalk. So if some one parked in front of your apartment backed in and let their car run for a while you would get an apartment full of car fumes. Even in the winter people would let their cars warm up and the fumes would get in through the door cracks. I guess you could even die if some let their car run long enough.

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I play video games.

My apartment doesn't allow people to back into spaces, is this common?

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