HotI - the issue is with the positional injuries that are more likely with the harness, and that they do not perform any better in accidents in terms of preventing injury. The issue seems to stem from the issue of incorrect installation or incorrect application, which is exceptionally easy to do and difficult to get right. Another paper also suggests that a major flaw in the H Harness design is that it is attached directly to the bolt anchor point, not the seat, and this directs massive force to the neck and head.
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