Bridge Collapse in Baltimore - Mass Casualty Event

Francis Scott Key Bridge collapsed early Tuesday morning (March 26) around 1:30 am local time when apparently struck by a container vessel. Below is a video of the disaster.

When I watch, it appears to portray first responder vehicles with emergency lights stopped on the right side of bridge as if they anticipated a collision was impending. But you can still see a handful of vehicles crossing moments before the collision occurred. It looks like the ship has engine power with smoke billowing from the stacks but the ship goes completely dark and then lights back up just before the impact. It seems to steer right into the bridge support. Reports are saying multiple vehicles plummeted hundreds of feet into the river below but it looks like the bridge was relatively empty when it actually fell.

https://youtu.be/iqipWZMo4zk?si=sc7QkEONYwyq7Yqg