Because when you are parking next to a car on the OUTSIDE of your arc the “point of danger” is your front end and you need to take into account that the front of your car is changing position during that maneuver. Swinging wide and then coming back in. When an obstruction is on the INSIDE of your arc, the area of concern is the back end of your car which doesn’t draw the same wide arc, it’s just pivoting around a point (your rear wheel). It’s much easier to figure out where that point is, and where it might be at any given time, than the constantly moving front end of the car.
Assuming you’re pulling into a parking spot instead of backing into it, you’re essentially ‘pulling’ your rear wheels into position. It takes more ‘pulling’ to get them close to the car on the outside of your turning arc than to get them close to the car on the inside of your turning arc. Since you’re pulling and not pushing, the rear tires never go as far as your front tires.
This is why some people prefer backing into a parking spot, because then you’re ‘pushing’ your rear wheels into position, in which case, they go further than your front wheels.
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