I'd assume that you'd see cars fitted with these if they were deemed safe for normal traffic speeds. Forklifts don't travel quite as fast...
In the 3-point seatbelts there's a "pulley-action" going on effectively doubling the strength of the belt and anchoring (or halving the strain on same during an accident). For the 2-point seatbelts for the middle of a backseat there is no such reduction. In our legacy we got a 3-point belt for the middle backseat which comes out of the roof and that's the only self-tensioning middle backseat seatbelt I've ever seen.
Make sure it's safe, not convenient
It is preferential to refrain from the utilisation of grandiose verbiage in the circumstance that your intellectualisation can be expressed using comparatively simplistic lexicological entities. (...such as the word fuck.)
Remember your humanity, and forget the rest. - Joseph Rotblat
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