I was under the impression that, due to CalOsha's regulations, that any roller coaster that takes it's passengers upside down must have over the shoulder restraints. This rule has long been cited as the reason MM absolutely ruined Revolution with those pain inducing shoulder restraints. However, upon visiting Knott's Berry Farm, I noticed that Montezuma's Revenge does not have these restraints (thank goodness!). Revolution only has one single loop and they had to install shoulder restraints yet Montezuma's Revenge, while also having one single loop (although you travel through it twice) still does not. How was Montezuma's Revenge able to get around the law (if there is one) when Revolution could not?