The board tells you that for bus 55, off-peak time is 12 minutes. The actual wait was more than 21 minutes. In fact, I think it was closer to 30 minutes.
In the time I had to wait for the bus to come, I could have walked the 3 stops to my destination. And if it wasn't raining, I would have.
THIS is the world-class public transport system we talk so much about?