Well, NJ has (sadly) become the first state in the US at limiting G-Forces on roller coasters
. The regulation calls for prohibition of forces greater than 5.6 that last longer than one second. NJ gave itself the right to regulate rides after an accident where two were killed from a malfunction, not excessive Gs. (A ride I rode once -- It's a kiddie-sized coaster, not what you'll find at Cedar Point, OH. The two killed were a seven year old and her mother.) This is also despite the lack of scientific evidence linking G forces to brain injury, and 320 million riders who turn out just fine every year. One brain-injury specialist interviewed said that you can exert 10 Gs just plopping into a chair, saying the state was "a little misguided."