Im only chiming in here to say I wish someone HAD stuck their arm out and kept my young Un-seatbelted head from hitting the radio knob, while I was asleep in the passengers seat of an Olds 88.
That took me on an ambulance ride to get several stitches. Not fun.
Seatbelts would have saved both of us, though I admit I suffered no trauma at all from my “stop-short” experience.