I also ring the 1,4000 pounds of explosives being used for training to be suspect. As another poster mentioned around 10-15 grams is more than
suffecient for training purposes. I figure that 1,400 pounds is enough explosives to severely disable a vast majority of the bridges in this nation.
Not destroy them but make them unpassable.
I think your numbers are off. Now, admittedly I have no clue as to how much ammonium nitrate or RDX is required to damage a bridge. However, I am
fairly certain that 1400 pounds of explosives aren't enough to damage more than a tiny fraction of the nation's bridges. My thinking is as
A quick search tells me that there are about 600,000 bridges in the US, give or take. Dividing 1400 by 600,000, you get about 0.0023 pounds per
bridge, which works out to 0.037 oz per bridge. That's roughly a gram of explosive per bridge. That's just not going to do much damage to
anything. I'm not sure you'd even get a decent firecracker out of a gram of explosive.
OK, so maybe we're only talking about special bridges, ones that carry lots of traffic. There the numbers get hazier. I would imagine that there
probably is some percentage of bridges that carry most of the traffic in the US - maybe 1% of the bridges carry 50% of the traffic, something like
that. Even so - 100 grams of explosive still isn't going to cause enough damage to interfere with traffic. These bridges are built to survive
massive trucks running over them all day long. I don't see how even a well-placed explosion of 100 g of explosive is going to cause significant
If a pound of explosive could damage a bridge, then maybe we've got something. Taking out 1400 strategic bridges would be enough to disrupt traffic
throughout the country, I imagine. But - is one pound of explosive enough to do it?
Besides that, I have to wonder why it would be better to damage a bridge, than to either take it down completely, or (if you want to use it in the
future), just post guards to block it. If traffic control is the goal, and if the bridges are only damaged, then I would expect a sufficiently
desperate citizenry to just go ahead and risk driving over the damaged bridge, unless guards were posted anyway.