The thought of forgetting a child in a hot car should terrify any parent. Nissan’s latest update to a range of new vehicles addresses just that, with Rear Door Alert. Nissan’s Rear Door Alert (RDA) is the first in the industry that “uses the horn, in addition to door sensors and a message display on the center instrument panel, to remind drivers to check the back seat after the vehicle is parked.” That’s not a combination of alerts you grow used to and disregard.

How does this work?

In vehicles with RDA, the vehicle “monitors when the rear door is opened and closed before and after the vehicle is in motion.”
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https://www.slashgear.com/nissans-hot-car-child-alert-rda-coming-to-all-4-doors-by-2022-31539565/