helmets

Im just concerned about specific track rules and "their" requirements..ie: rules and regulations. I notice some glaring exceptions to NHRA rules which completely disregard et's. Example, FAST class: LOW 10 sec cars without 6 pt.rollcage? Isnt the rule 11.99 and quicker? Also, totally street legal Shelby GT Mustangs running 8's without chutes?

So far I have seen (2) e.t. rules for helmet requirement. 12.99, and 14.00 or quicker.
Mr Twister- helmet laws differ for m/c operators from state to state. Riding on the street wouldnt be considered a closed course competition. Thus no need for the competitive protective gear.