Helmets, rollcages, and firesuits (oh my!).
But seriously, getusummm has a valid point. We all spend so much time working to make our cars fast and it is much more rare to concern ourselves with making it safe at the track.
I was at New England Dragway a few years ago during a Nostalgia event (my dad has a 60's dragster) and a guy was running a ProStreet first gen. Camaro. The car was done up right. Big block, supercharger, full cage, 4-link narrowed rear, tubbed inner fenders and big meaty slicks. The guy started to make his run and started to loose control about 1/3 way down. He must've had too much pride/ego to take his foot out of it and by 1/2 track he was skidding the rest of the way on his roof. When he got out of the car (unharmed I might add), he took off his helmet, spiked it on the track, and then threw his neck brace at the car (thought that was a little unsportsmanlike). All of the safety features in the car saved his ass. The only thing that was hurt was his wallet.
I'll take a hurt wallet over a visit to intensive care any day.