I just received my policy renewal for 2007 from Safeco - almost verbatum the same language as SF: no coverage if vehicle is driven on a surface intended for racing. Doesn't matter what you're doing on the surface, just if the car was driven on that surface...Which begs the question of our corner workers (ICSCC and BMWCCA) who drive their cars on the racing surface getting to the corner stations. Not that anything should happen, but it could, and do they know that their insurance is most likely null and void at that point?
Regarding personal liability - auto doesn't cover it at the track, but my umbrella policy does. I don't sell insurance nor am I associated with insurance, but I believe these days everyone ought to carry an umbrella policy. It's relatively cheap for what you get.
That's in addition to the waiver everyone is supposed to sign prior to using the track, spectating, or volunteering...
'90/'87 325i Pro-3 #130
Shut your pie hole and race already!
2011 Dodge Charger badassedness
Assorted mish-mash of four-wheeled spectacularance