Why do car doors have a half-closed state

Question

It’s very annoyng when a car door doesnt close properly, and I think it could be avoided with a better locking mechanism. Why is it that most doors can close at once but car doors are more complicated?

In: Engineering

Answer 1

So if, for whatever reason, the door doesn’t close all the way it doesn’t fly open while you’re driving. It’s a redundancy.

That said some high end cars will pull the door the rest of the way for you.