Quote:
Originally Posted by chickabiddy 
I think we're arguing the same thing here: any booster (without a harness) is a belt-positioning booster. There are high-backed belt-positioning boosters and backless belt-positioning boosters. A highbacked BPB is recommended when there are no headrests. You are correct that a backless BPB would make the situation worse.
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It's generally not recommended to improvise a booster to improve seatbelt fit, but adults have fully mature skeletons and can generally get away with a bit more than kids can (but again, that doesn't make it safe, just less unsafe).
Yeah, I was thinking of high-backed boosters as only having harnesses.
