I've had two three SVAs on bikes, both all, arguably my fault
1) RH turn on LH bend with a group. In WInter, in the Fens. Possible mud/shit/diesel on road, or possible crossed white line, or both. Either way, both wheels went from under me, cue sliding across the bend to the opposite kerb, bent derailleur hanger and large bruises. On reflection poor choice of tyres for the conditions.
2) Testing recumbents in Lt Thetford with D.Tek, on a Bachetta Giro 26, getting up to some speed through the village. Similar to above, white line, front wheel washout, sliding along on my right ankle, hip and shoulder. I still have the scar on my ankle (abraded through two pairs of socks over the ankle bone).
3) shitty conditions, following a car, over a roundabout, focussing on the RHS sideswipe potential, followed the car across, accelerating. Stealth ped jumped out onto a zebra crossing 100yds after the r/b, car stopped, I didn't
Of those 1, 2, no real argument, perhaps solveable by a padded road surface or airbag cocoon.
Only number three has any real infrastructure implications.
I'm not counting the almost stationary forget to unclip and fall over incidents