I don't think sprint cars should be redesigned from what they are now. If they scare you, stay away from them. My suggestion is miminmum 17 years of age and a valid drivers license. Also, at the pit sign in, have a cut out of Barney Rubble or Fred Flintstone that is about 4'-10" tall and have a sign on it that says. "you must be this tall to ride this ride".