On 26/07/2018 19:02, Nightjar wrote:

https://www.sae.org/publications/tec.../2010-01-0067/



Odd statement from that link..

"Seat belt forces were lower for all occupants in the aware condition,
indicating that their internal musculature altered their subsequent
forward rebound motion."

There is a better alternative theory for that.. when the brakes are on
there is less forward acceleration of the van and hence less force on
the passengers to create the rebound.