While racecourses have now come under the same Health & Safety Rules as football stadia (since this tragedy and others), not much seems to be learned by some of them, or the Police, it seems.
Last Easter, Plumpton took in some 10,000 racegoers, and rammed their infield solid with cars. There were horrendous problems in getting people off-course at the end of racing, since they refused to open their top gate, the only other egress apart from the railway gate, which was often unusable due to the trains stopping outside and the railway crossing gate being shut (usually a wise precaution when there are cars on the road!).
Not only was no security sent down to direct the internal traffic until racegoers had pulled out railings to make unofficial exit points - and eventually five, instead of one, escape roads (and blocked the emergency roads while they did so), but the security men communicated with each other by MOBILE PHONE, which meant they couldn't call anyone on a radio, and the Police had radios which didn't communicate with other racecourse staff, including the day supervisor, and of course didn't use mobile phones. So you had three layers of staff, all unable to communicate with each other, in critical security positions.
It's one of several reasons why I refused further employment with the course - having been on duty at the railway gates entrance/exit (but not in charge of traffic) I'd had enough when my radio packed in before the third race each day. Were the loose horses secured? Could I safely open the gates? Who the feck knew or could tell me, as radio after radio broke down or gradually couldn't find the range during the meetings. The supervisor employed to head up raceday personnel and H&S came up with a bonzer answer, though: take two radios with you!
So, if, after having to meet supposedly stringent H&S testing and certification, a course can be that lax, I wouldn't be surprised if football and other sporting stadia's Health & Safety was also getting a bit frayed around the edges, and their personnel complacent and corner-cutting. I hope not, but I wouldn't bank on it.