Lay down on purpose? I don't know if that's within my reaction instincts. I hope not anyway.
I did a tank slap get off many years ago, but it seemed I had no choice. The arresting officer asked how fast I was going, for a "foot peg scraped the asphalt for 262 feet." I told him, "I dunno, 30?" Not bragging - just amazed at surviving it. I was fairly 20 something immortal back then. Not so much anymore.
While I have no experience or data to support this notion, I've imagined a scenario whereby I would leap up off my very sturdy midship pegs to try and and jump over a car suddenly in my path. It would seem necessary to have the balls of your feet on the peg to pull this off, if even feasible. I figure the car's windshield or side window may be a kinder gentler ride than the grill. Maybe that extra X inches of glass shatter deceleration would reduce a fatality to a 'mere' maim or dismember? Hope I never have to figure it out.
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Random safety thought that popped into my head -
secondary road - long line of vehicles coming at you - car #4 can't see ahead but makes a left anyway. It tends to make me ride to the right in that scenario and get some headlight out there, but that's probably not a surprise to y'all. This happened to my kids many moons ago. Both were OK as Granny had them in car seats. One was X shaped heavily bruised from the car seat straps, the other bit her lip at impact. Granny almost needed a tranq dart shot to calm her down. Both cars did what they were designed to do and crumpled down to offer some impact absorption. So as far as "we never used passenger restraints and rode around in cars with bridge girder frames and no harm became us" saying goes, all I can say is you were lucky. My ex & I received a phone call stating our daughters had been in a head on collision. No other info as to their post accident condition was available. We were a half hour away. A very long half hour ride indeed.