To combat this very real problem, Nissan introduced Rear Door Alert technology in its 2018 Pathfinder that reminds owners to check the rear seat upon exiting their vehicle. Instead of a simple warning text on the dash, Nissan's system includes "a series of distinctive honks as the driver walks away from the vehicle." RDA monitors use of a car's rear door, and if it's opened at the beginning of a trip but remains closed at the end, the warning system activates.
RDA was developed by two engineers at Nissan who are also mothers. For 2019, Nissan has spread RDA across much of its lineup, including the Altima and Rogue. And by 2022, RDA will be standard across all four-door Nissan vehicles, including pickup trucks.