On Jan 29, 11:07*am, Stephen Sprunk wrote:

Movement of tanks. *That is the origin of the clearance, lane width and
bridge-strength requirements--and in turn limits the height, width and
weight of new US tanks.

I'm not sure that's true. Tanks are not very kind to concrete roadway
surfaces, nor do they move very fast, and of course drink up fuel. I
would think if tanks have to be moved any sort of distance they would
be loaded onto trains.