I saw a few Semi Trucks pass over it about a minute before the collision and collapse. There were construction vehicles on the bridge, with flashing lights.

I'm reading here on local news there were multiple construction vehicles on the bridge when it collapsed.

You can see the construction vehicles on the bridge on te right of the container ship, they are standing still and are running flashing lights. And they go down into the river ...

You can clearly see headlights moving across it as it comes down.