Everyone freaks out when they think of overinflating a tire on their car, bicycle, or other vehicle. There are horror stories of decapitation from exploding tires everything else. I think it's only common sense that high pressure release valves be installed in the side walls of tires using a stem similar to the one used to put air in the tire. These price of such valves should be negligible when added on the price of already expensive tires. The valve automatically releases air when the tire is filled to its rated capacity. It's possible that the valve could be built into the original tire stem itself. Of course, it's obvious that people would stop using tire gauges altogether, relying solely on the emergency valves. I'm not sure if that would be a good or bad thing.