If your talking about openings, Then all tracks should have walls and catch fences and gates with catch fence at the entry and exit.

That's Idea.

The reality is there are tracks being run by promoters who don't own em. Tracks with any variation of walls, fences and even no walls or fence or any combination of the above.

I stand by my statement, Yes, many could and should be improved. Ultimately if a racer thinks a track is unreasonably unsafe. THEY SHOULD NOT RACE THERE.