Washed away bridges

With this kind of money spent on their construction, it is rare for a bridge to collapse, not least because they are designed so that such disasters do not happen. So what happened to the Moshupa bridge?

Why on earth did it so dramatically collapse? The obvious first answer is that it was not a bridge, it was a culvert. To use different words for the same thing may seem picky but the fact is that they are not the same.  A bridge allows water to pass through its piers.