As a former corner worker at automobile road course races in the US, I always hate to hear about injuries to spectators when there is a crash on the course. You really need to develop a sensitivity to where the debris fall-out area will be in the event of an accident, and even then you have to stay alert at all times. I have had a few close calls in my time (like the time I was stationed in the debris fall-out area and three cars entered a corner which was only wide enough for two to exit, and had to run and duck behind a barricade to avoid the aftermath). Unfortunately, you won't get the best photographs in safe areas.