Unbelievably dangerous not just for the drivers who would be severely injured or killed if they lost control but the same thing for the spectators should one of these lose control and run into a completely unprotected crowd member. Not a question of if it will happen but when.
This was 9 years ago btw we have water filled jersey barriers now. these things are awesome and we know how to run away here. stop being a pussy behind a keyboard and come out to watch lawnmowers go 60mph.