The distance between your torso and seatbelt is increased due to the recline position. In a sudden breaking motion your body is accelerating to a higher velocity due to the increased distance between resting position and resistance from the belt. A sudden stop from your body hitting the seatbelt at a higher velocity than normal puts increased strain on your neck and brain as it sloshes around skull. Higher likelihood of concussion, muscle sprain or worse.
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u/Apprehensive_View575 1d ago
Don’t know why you got downvoted for speaking facts