About 5 years ago I had my parking lot repaved. The paving company intentionally put a shallow slope in the asphalt so that rain and snow melt would run off the parking lot. But, the slope we're talking about is only about 1/8 of an inch per foot; about half of what's required for drain piping.
But, every year I get several tenants knocking on my door and asking for shovels and ice chippers and salt because their cars are stuck in the snow in their parking stall. And, I've finally figured it out.
Tenants won't bother to remove the clumps of ice or hard packed snow that forms behind their wheel wells. As long as the car is in motion, convection removes the heat from the body of the car. But, when they park their cars, the heat from the interior of the car warms the body of the car, and these clumps of ice fall off BEHIND their wheels. So, then, when they want to get out of their parking stalls, those clumps of ice act like wheel blocks to prevent the car from moving, and their wheels just spin and dig holes in the snow.
So, if you live in a climate where snow collects into massive stallagtites behind each of your car's wheels, use a hatchet or something to cut those things off before you park your car. Then, when you next put your car in reverse to pull out of your parking stall, there won't be those blocks of ice behind your wheels to prevent your car from moving.