The thing with safety is, you really want to know before things go wrong. Just filling up sections until there's a problem isn't ethical.
Not entirely sure that's what you were getting at, though?
Sorry about the late reply. I forgot that I had a question posed here.
In my experience, there are three phases to consider while talking about safe standing.
1. Ticketing - The number of tickets to be issued considering how many people could be safely accommodated etc.
2. Maintenance - There is a certain amount of work to be done in terms of constructing folding seats and erecting barriers. Not with just the construction part, but the maintenance part.
3. Safety - What to do when things look like they are about to go wrong?
I will try and explain them in a more elaborate manner. I was constructing and simulating a small stand. Closest I was able to find was this.
We were told to design the stand in such a way, that it can seat about 48 people. And if the seats were removed, about 56 people standing. I delivered the stand and it got me thinking about the ticketing side of safe standing. Say, we have a stand that can seat 10000. We split them into 10 sections equally. So it has 1000 seats in each section.
We do testing to find out how many people can "safely" stand in the same area as 1000 people who are seated. During testing in a controlled environment, we first send in 1000 people. And then another 25. Another 25. And at each stage, we find out what the comfort level of people inside is. And then we stop at, say, 1250. We do this in every section. An increase of 250 people per section. This means that, as far as construction is concerned, we have the place for 1250 people to stand, per section, which, otherwise, would seat 1000. Here, I am only talking about the construction/design stage and how many tickets should be allocated in each section. Get it? A person's ticket would only read, standing zone 4, lower tier. So, we only sell 1250 tickets for standing, per section.
Now comes the safety side. I have visited Hannover stadium and the Mainz stadium in the Bundesliga. Both to watch games and also for job-related surveys. And I that is where it occurred to me about the question regarding safe standing. Take a look at the photos below.
1. Hannover safe standing
http://fiftyfive.one/wp-content/uploads/2016/05/Cropped_Hannover_DoubleRiser_JDarch.jpgWe see a barrier, about 3.5ft tall and each barrier, has folded seats.
2. Mainz Opel arena
http://www.groundhopping.se/res/Mainz/entegatribne.jpgPay special attention to the entrances. Those entrances are wide. A mini lorry could easily drive in through the entrances and have the place for a small car.
What I thought of, is a combination of all the three.
1. We limit the tickets into the standing zones.
2. We erect safe standing barriers.
3. We build 1 entrance every 2 sections. Which means, only 2500 people pass through an electronic turnstile. And there are 5 entrances. The section themselves do not have any barriers between them. So, the whole stand would be housing a massive 12500 number of fans that are standing. Imagine a Mainz stadium with Hannover barriers.
The stadium/stand will obviously be regulated by security men in neon uniforms and will be CCTVed.