Seriously. Take the local trains for example. They have buttons on the doors for you to push so they open automatically. When the doors are out of order (which they are all the f'ing time), there is a big red sign on the door window saying "OUT OF ORDER" in big black letters, and the picture of a closed door underneath.
Now, imagine that it's early in the morning, the train arrives and is overcrowded save for one wagon, which is completely empty. There are big red signs on every door of that wagon. You should think that even a bloody baboon could work out the obvious, but some people always rush to those wagons pressing the door buttons five times in a row wondering why the door won't open. And then they go to the next door. I mean, you don't even have to be bloody literate to see what is happening. It's not like red was ever the signal colour of "everything alright, proceed", or that a pictogram of a closed door is ambiguous. And it's not like there are no windows on those trains for you to see that nobody is inside. Hell, you don't even have to be able to count two fingers on your hand to see what is wrong. And yet it happens every fucking time. It's a miracle those people manage to put on a coat.