There was one on I-25 between Colorado Springs and Denver, but it is being turned into a bridge during the construction of the express lanes.
Here is what it looked like.
when we visit our grandparents in New Mexico, we sometimes take old US 66 just for fun, and the old road goes under the highway in
this.
And, although not on the interstate,
this is in the same area, and it is literally a big culvert. The google car hasn’t been there in a looong time, but from what I remember, it was similar to
this. I’m sure there are other haul roads that do this, but it’s the only one I have seen.