Andrew - negligence claims are founded , essentially , on a breach of the duty of care X owes to Y, in respect of foreseeable events . What that duty involves is not set in a tablet of stone , but is decided on a case by case basis, taking account of all the circumstances . The fact that some track day companies don't insist on FIA bars , or cages , is relevant in any claim , of course , but isn't definitive. You raise an interesting point though - unfortunately, whilst considering potential track days issues some time ago (before the bar debate and when I was still on MT ) , I did attempt to engage with the track day operators' association and received not even an acknowledgement and gave up after several reminders . I also failed to get a response from a couple of TDOs I contacted.... BTW , once you give advice you do not become automatically liable. You may do so- but , as ever with legal stuff , it depends .....