Some cars already have this safety device.
A man recorded a woman in California as she left her infant alone in the back of a car on a hot day while she shopped.
Cars come equipped with alarms that remind motorists to buckle their seatbelts, chimes that indicate headlights are still on after the engine is turned off and buzzers that sound if keys are left in the ignition, says Janette Fennell. Forget a sleeping child in the rear seats, however, and drivers are on their own.
Ten minutes is all it takes for a hot car to become a lethal oven for a young child. After a New Hampshire man leaves his four children in a car and the 21st child death this summer NHTSA is reaching out to parents with Heatstroke Awareness Day.