One can tell when high rise construction is going on in NJ's Hudson County Gold Coast. They got these convoys of oversized tractor trailers hauling 10'x40' sections of prefab concrete on RT 78 East from PA. I assume they are flooring sections. You see them once and a while but not like they used to in the late 90's. I haven't been to Port Newark area near NJ Turnpike in about 3-4 months but there used to be mountains of shipping containers occupying acre after acre stacked to the sky post 9/11. There are a lot less of them there now.