Civil

$2.2 trillion. How much is that? Consider that one hundred, $100 bills is about 6 inches X 2-1/2 inches X a bit less than 1/2 inch thick. So you could carry around this $10,000 in a coat pocket without showing any sign of it. So now get yourself 100 of these $10,000 stacks for a cool million dollars. You could still fit that into a duffel bag and walk around without much notice. Now multiply that times 1000 to get a hefty $1 billion and you are going to need a fairly large room to stack this up. Now multiple that by 1000 again to get to a trillion (remember, we are talking about 1 million X 1 million now) - and you'll need something like an airplane hanger to hold all of this cash. Remember, these are $100 bills we're talking about, not ones. Double that one more time and you're getting close to $2.2 trillion. A few more ways of looking at this can be found here.

So what is so magic about this figure? That is the rough estimate in 2009 from the American Society of Civil Engineers as to what it will cost to replace or repair the aging infrastructure in the United States alone. Jay Bhatt, Senior Vice President, Autodesk AEC, led off the Infrastructure Keynote address titled "Critical Tools for Critical Infrastructure" with this fact, noting also that the ASCE gives the US infrastructure an overall grade of "D".  Read more »

In AutoCAD, you can assign a non-continuous linetype to a 3D polyline, but it will not display or plot.

If you need 3D polylines, and you need a non-continuous linetype, for example to represent the flowline of a ditch - there are a couple of workarounds. Both assume that you have assigned the correct linetype to your 3D polylines.