We just found the answer for track limits. I'm not advocating hazard to drivers but Kvyat's shunt serves a reminder the penalty on driver error. I'm not a fan of the AstroTurf, it would be better off with rumble strips/ same goes to other Tarmac runoffs. the run offs should be able to slow the cars down as a deterrent and a safety feature. I'm suggesting a rough surface pavement.