On the rendering, it seems to me that the part over the water is significantly shorter than the now collapsed part. It also doesn’t look heavier per meter to me, and the tower seems to be perfectly vertical. That would make it impossible to fully ‘hang’ the part over the road from the tower.

=> It is quite possible that the span over the road was designed to be self-supporting.

That would be a non-standard design, but we are so good at building such bridges that ‘being non-standard’ almost has become the standard.