In addition, I think it's much easier to go back into the field and examine a bridge to ensure that something important was constructed to the specifications th

In addition, I think it's much easier to go back into the field and examine a bridge to ensure that something important was constructed to the specifications that you required. This is not the case with most of the software people write, certainly in this case it's pretty difficult for a developer to pull a car of the production line and verify that the code they wrote made it into the car without any changes.