And therein lies the difference.

Here in the US, there is this magical assumption that just because a sign is posted, even multiple times, that's it's automatically going to be read and adhered to. TSA, including some on this board are incredulous as to how passengers don't read every one of the hundreds of signs at the airport.

In many airports outside of North America, there are a lot fewer of those signs. Yet things go a lot smoother there. Wonder why.