These cars will honk if something is left in back

Nissan's "smart" alert system will alert drivers to check the back seat after the car is parked.

This week, Nissan announced that its 2019 models for eight cars, including the Rogue and Altima, would include the alert system. By 2022 RDA will be included on all four-door trucks, sedans, and SUVs. The fairly simple technology works by monitoring the rear door — is it opened and closed before and after the car starts? 

If you opened the back door before a trip but never reopened after the car is off, the system will start with a notification on the dashboard. Eventually the car will begin "chirping" louder and louder through the horn. 

The idea came after story after story hit the news about someone leaving a child in the car, or a pet in the car.

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