Right, and I think what you're getting at is that there is a distinction between the generated demand that the new lanes induce, and the latent demand which was

Right, and I think what you're getting at is that there is a distinction between the generated demand that the new lanes induce, and the latent demand which was already present before the new lanes were added but went unsatisfied. Adding new lanes to the road allows that latent, pent-up demand to be satisfied--the induced/generated demand is the mechanism of that satisfaction.