I had a wee look at a Vauxhall/Opel Lotus at the weekend. Back in the '90s they introduced a Helmet support wraparound thingy for the chassis and it became mandatory within the class. The ex FVL people will remember it. If a HANS device was used in conjuction with it, it could be a good job and may solve the possible rollover problems. But it might need to be a propriatry part for each chassis which would be difficult.
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