"Andrew" wrote in message
news
Actually, looking at that silver people carrier, I suspect it rammed
into the wall in reverse which is which why its wheels are hanging
over the edge. That retaining wall has an L shaped bottom which
looks like it was attached to the precast flooring sections with
rebar. where the man is attacking with a breaker is the top surface
so you wouldn't expect to see any rebar there.

Whatever weakness had built up in the structure because of concrete
'cancer' was exposed by the sudden impact.

Ah, now it becomes a bit clearer why there are vehicles with their rear
wheels hanging (or else almost hanging) off the floor. I'd thought that the
wall was flush with the vertical pillars and horizontal beams on that floor,
and that therefore the collapse had also made vehicles roll backwards. But
looking at the floor above, it extends another metre or so, so part of the
floor has snapped off, back to the level of the horizontal beam.

The silver Transit-type van doesn't appear to have any damage to its rear
end, which you'd expect if it had hit the wall hard enough to snap it off.