[Zeke]

I'm sure the new surfacing had to do with this. The rollers weigh a lot and they put stress on the castings if they roll over them. Maybe not new covers and receiver frames either.

I have noticed (now that I think about it) that the rollers work around the manhole covers when redoing a street and then they come back and do the ring around the steel frame by hand.

There is a different shade of gray/black ringed around that. I wonder....