I have seen videos of cars that do not have a B-pillar. I think it looks much better because it reduces the separation between each row. It’s hard for me to understand that a roof is heavy enough that it needs a support in the middle.
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In some countries, it became illegal to have doors that opened at the front (hinged at the back). That is because if it was slightly opened while moving, the airflow would pull it wide open. Also, it made the leading door edge sharp — it you were hit by a door hinged at the back you would be hurt by the panel of the door, but you wouldn’t get chopped by the edge.
It you don’t have the B-pillar, you can’t hinge the rear door at the front, and you don’t have a mount point for the front seat belt.
Taxis in London still have the rear doors hinged at the back, but they have automatic locks and a professional driver.
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