The Francis Scott Key Bridge in Baltimore has collapsed after it was struck by a ship. Possible mass casualty event

The Francis Scott Key Bridge in Baltimore has collapsed after it was struck by a ship. Possible mass casualty event. How could this actually happen? 1. There must be restrictions on boats passing under the bridge, height etc. 2. The bridge collapses completely. So, the build quality must be questioned. 🤷‍ ️ Source: Vanessa Beeley