"the anti-truck-bomb obstacles (on the entrance only -- no self-respecting truck bomber would ever think of driving in through the exit, would they?)"
This is the sort of thing that never stops to amaze me, usually when visiting some installation or other there is a detail like this that jumps out. The best example that I have of this was a perfectly sealed isolation ward in a hospital that merged both intake and exhaust of the isolation ward with the general wards because they ran out of budget for another air system so they plumbed it into what was already there. It totally floored me that this was done consciously as a cost saving measure, I'll leave the failure modes as a homework exercise ;)
"the anti-truck-bomb obstacles (on the entrance only -- no self-respecting truck bomber would ever think of driving in through the exit, would they?)"
This is the sort of thing that never stops to amaze me, usually when visiting some installation or other there is a detail like this that jumps out. The best example that I have of this was a perfectly sealed isolation ward in a hospital that merged both intake and exhaust of the isolation ward with the general wards because they ran out of budget for another air system so they plumbed it into what was already there. It totally floored me that this was done consciously as a cost saving measure, I'll leave the failure modes as a homework exercise ;)