I don't generally see industrial / construction vehicles, I just get buses to draft on my commutes and they like to play leapfrog with me. The buses are generally much easier to draft than cars not even just because they give a better draft, but they don't speed because they're monitored (I think). There's some stretches where traffic goes slower and I can roll with the cars, then the road gets a little wider and they just slip away into the distance...