it protects from tension and compression
It is any type of support beam or structure.
No it's not it's a noun.
Superstructure
span
the substructure-gogodude32
Gravel. Aka, Roadbed. Ballast is what they call it.
code 83
roadwork(s) roadside roadway roadkill roadbed roadrunner roadster
Its not the speed over the roadbed that counts (all 3 are about the same) but the fact that unit trains do not need to be classified at each intermediary yard that makes them the "fastest".
Yes, it is like a bridge, but it is generally a natural formation. A causeway is a raised roadway or roadbed or natural bridge, usually over a body of water. A "bridge", in the majority of cases implies a man-made structure.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern --ADB--. That is, seven letter words with 3rd letter A and 4th letter D and 5th letter B. In alphabetical order, they are: deadboy roadbed
Many Irishmen came to the United States to take jobs building the transcontinental railroad. The roadbed was dug by hand, the cross ties were laid by hand, the tracks were laid by hand, and the spikes holding the rails to the cross ties were hammered in by hand. Irishmen, or tarriers, were an important part of those crews, especially the dynamite crews.