Building a park over I-5 in Seattle

I love the idea of this.  No, I do not live in Seattle.  I do however visit there often and have many friends that do live there.  Yes, I do have a B.S. in Environmental Science and hug trees.  🙂  There are my disclaimers.  The article by Jen Kinney, Seattle Architect Says the Time Is Right for This Highway-Capping Park Design lays out some great points and this is would not be the first one even in Seattle.  This is a beautiful city that struggles with the topography and keeping access easy from one area to another.  This would be beautiful and yes expensive, but growth and change are good.  What do you think of the idea?

Credit: Patano Studio Architecture