[PajamaTruthMafia]

But why suspend a multi-ton concrete slab over traffic?

The original reason given was the need to create a plenum (air duct) to evacuate the exhaust gasses from the tunnel. The reason they were so heavy was they needed to sustain hurricane force winds when they cranked the fans up all the way in the case of an accident and fire. Then, there were some reports that said they didn't need to be so heavy as they were mostly cosmetic.

Now they are taking down all the panels and will reopen the tunnel w/o any because they "think" it will be ok....

If they do indeed need a plenum and they open the tunnel w/o it, and there's a big fire and they can't evacuate the smoke, there might be a major disaster in our future...

[river rat]

If true, that these concrete panels were hung primarily to create a plenum for exhausting fumes or smoke ---- someone needs to be shot...

Perfectly functional plenums could have been constructed with a LOT less weight that 2 tons per panel --- at less cost and nearly zero threat of collapsing on cars below..

Multiple large diameter galvanized duct work sections would seem to be adequate.....

Even in the event a sheet metal panel fell -- it may be less likely to flatten a car..

Semper Fi