@tiggerbluedevil @mskathleenquinn Call it what you like, it all comes down to what is too much crowding for the level of safety that society deems appropriate and what isn't. That's not a set number defined by geometry, it is a matter of making tradeoffs.
@tiggerbluedevil@mskathleenquin随你怎么说，这一切都归结为社会认为合适的安全水平的过度拥挤和不合适的程度。这不是几何定义的固定数字，而是一个权衡的问题。