Helmet Safety Comparison study
Virginia Tech School of Biomedical Engineering does helmet safety comparison and publishes rating system:
Too bad it is for football helmets not riding helmets.
Schools and parents can now make informed decisions on how best to spend their money and I strongly suspect football helmet manufacturers are scrambling to improve their products and increase their scores in the next test.
Maybe somebody, someday will get to equestrians. I still don't understand why the results of testing on riding helmets is pass/fail based on a 20 something year old standard and the relative results are kept secret from users/buyers