Even my humble Transit van has parking sensors which beep when I’m getting too close to a bollard or a kerb.
Today’s invention is to apply these sensors to the doors of all cars. Instead of beeping, though, when the sensor detects something in the way of the door, it simply applies a brake to that door, stopping its movement.
This would stop damage being caused to a vehicle and also all other vehicles that it might park near, by careless door opening.
It might also be useful to the tiny number of folk with gullwing or scissor type doors which are notorious for opening upwards into low garage ceilings.