Harm Preventor (Brit spelling of preventer)

A new feature on the very foremost part of the undercarriage of automobiles that, when activated by a sensor, quickly plops down a substantive amount of matter when a large pothole is detected thereby allowing the tires to land on and roll over the new fill. This would reduce damage to tires, wheels, and axles, and the material could be removed upon repair of the pothole or left in place if it were durable enough to be filled over.

This would work for one pothole per trip, for it would need replacing. It would prevent physical damage as well as mental stress, let alone the financial savings from replacing and patching of tires, etc. Since folks were able to imagine mechanisms that could pop out of cars by the '60s (see image of Wacky Races), you'd think this could be realized by now.