Hi everyone, I have been thinking about this and just wanted to put my findings. About why it might be inevitable that there are casualties at large runs. Just by numbers alone. I don't mean this to be a snidy you shouldn't complain about this post. Coming across something tragic in a race must be very hard to deal with, and continuing to run, even though its the right thing to do when there is already medical support on the scene must be really conflicting and I'm sorry for people who experience that.
With the injuries if there's 57,000 people doing it and they take 2.2 hours on average (from wikipedia 2015):
That's 2.2x57,000=125,400 hours of running/walking
or 125,400/(24x365)= 14.3 years
that's about 14 years of running just in the one day. My local parkrun (south manchester) has an average of 257 runners per week and has been going for 435 events, that adds up to:
"Total hours run: 5Years 207Days 1Hrs 49Min 12Secs".
If they haven't had a casualty there then I bet they've been lucky, I know some parkruns have a defibrilator because of the risk. That's why I'd say it isn't irresponsible but inevitable that at the GNR and events like it there will be casualties, its a big concentration of running time.
I guess therefore its no surprise the routes are lined with regular ambulances and medical stops.
Even if the GNR was cut into tenths, there would still be the same number of casualties.
Assuming that is the case anyway, I guess people look into whether there are more than would be expected per/1000 for example. Maybe that is how they decide weather to increase it per year or not. Anyway I am speculating and it isn't important. I hope that makes sense, and doesn't come across the wrong way, just something to factor into deciding on large events, there maybe no increase risk per individual, but there will be an increased risk of coming across the accidents.