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Not so smart cars have this.

My 2 year old Hyundai Palisade has rear seat detection via ultrasonic sensors - and I believe newer ones are using radar.

https://www.consumerreports.org/car-safety/guide-to-rear-sea...



My eyes initially skipped over the "Hyundai Palisade" part of your comment, so I assumed you were saying that your 2-year old in the back emits an ultrasonic scream when she is left in the car.

Which is probably accurate.




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