They do, just not universally. The infrastructure bill included a section requiring them, so every new car will in a few years, along with systems to detect if

They do, just not universally. The infrastructure bill included a section requiring them, so every new car will in a few years, along with systems to detect if you're impaired or drunk and refuse to allow operation if you are. https://www.consumerreports.org/car-safety/auto-industry-agrees-to-put-rear-seat-reminder-systems-in-most-new-cars-by-2025/ https://www.consumerreports.org/car-safety/auto-industry-agr... https://www.cnn.com/2021/08/12/us/hot-car-deaths-infrastructure-bill/index.html https://www.cnn.com/2021/08/12/us/hot-car-deaths-infrastruct...