[jeffers]

Something I noticed studying the images, was that the roughened deck surface visible after the collapse appeared to be confined to the SW corner of the bridge, maybe from pier 5 and south, in the southbound lanes.

I imagine the contractor had an overall schedule, and other parts of the contract work could have been underway elsewhere, but that corner seemed top be the primary focus of work in progress from what the post collapse imagery showed.

[KC Burke]

Then it seems to have appeared to have been a scarify and re-surface type of repair if roughened pavement is what was seen.

With that type of repair it can have a new surface in either concrete topping or asphaltic topping depending upon the substrate of the paving. Both operations can either be done in small segments or in large scale paving operations as previously described.

In either topping we are not looking for "trucks loaded with gravel" as some news accounts describe, but instead, we are looking for trucks loaded with hot asphalt or ready-mix trucks. The former would have been servicing a paving machine:

The machine and the trucks servicing it should have been smaller that what is shown above but this shows the operation and machinery type.

A concrete paving operation could have been a small vibrating screed with almost no weight or something of this type

Again, this is a larger unit that what would be used for bridge topping but it shows the sort of machine utilized and its appearance for those not familiar with this process.