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The safety features are worth millions of crashes prevented and thousands of lives saved, making them remarkably cost-effective.
Capping the luxury features and size of passenger vehicles would do a lot more to bring down costs than removing safety features.
They also put a distracting video monitor in front of the driver 100% of the time, not just the 0.2% while backing. Manufacturers have moved a lot of controls to that screen, rather than leaving them on tactile buttons and switches that could be operated without taking eyes off the road.
How many collisions have been caused by distractions from the these screens?
They would have done the screens without the backup cameras.
Not if those distracting screens were prohibited.