A few years ago, a series of roundabouts were built near where I lived at the time, and some of them were on a bus route. They were very large in the centre, and the road round them was quite narrow. Buses had no alternative but to go over the top of them.

However, whoever built these ones miscalculated the height, and soon after they were built, there was the amazing sight of a bus marooned on one, with part of its "undercarriage" well and truly stuck, like a turtle on its shell. They lowered them very smartly after that. It seems quite ridiculous to me, putting them on bus routes, but they continue to, and the buses go straight over the top.