Pumps' Perplexities

I have come to the conclusion that the various Departments
of Transportation have got their acts together in repaving
roads....The road equipment, alone, is a pleasure to watch
in motion.....They scrape up the old, lay down the new and
roll it out.....One truck following the other.....

Did you ever notice that they do not repave over a little
bridge?.....That little thing which goes over your local
creek or in fact a larger one.....

The repaving always stops and then restarts past this
little concrete bridge because the bridge is designed
to "bare" a certain amount of "weight"....An added coat
of macadam would alter the "weight load" of the bridge.....
This is a "no -no" in the engineering field.....Pumps