I hate when pelican crossings take too long to change. You press the button and it's supposed to change the lights to amber then red so you can cross the street. But you wait and you wait and you wait, until finally, about 10 minutes later, they change.
Why does it wait? To let some more traffic through? Why? There's always going to be traffic, it makes no difference to the traffic whether it stops now or in 10 minutes. So why make us wait? It makes no sense and just inconveniences pedestrians for no reason.
Because if it is a busy crossing with people crossing all the time, and the lights change as soon as you press it, the lights will be almost permanently on red for the traffic.