Architects don't design bridges; civil engineers do. They also record their stress and strain calculations in documents that are considered part of the drawing, and the engineer damn well better be able to produce them if they get sued*.
And while the contract you sign may not have all those lovely footnotes, the brief the lawyer presents to court probably will.
And they will, even if the tort was because a piece of poo fell on them from a manure truck crossing the bridge.
Information about American English usage here and here. Floating point issues? Please read this before posting. — emc