Uh, Denver is aggressively building a public transit system.
Since 2004 our FasTracks program has built four light rail and commuter tracks and have another four to be built by 2020, plus they're instituting a Bus Rapid Transit system from Boulder. The I-70 expansion is at the behest of the State of Colorado's highway system mostly because that stretch of I-70 is crumbling and only expected to last another 10-15 years. (As someone who drives this every day on my commute, I can bear witness to the huge gaping potholes - I can see girders driving on some overpasses.) The neighborhoods to be impacted are largely industrial - the huge and smelly Purina Dog Food plant would have to be relocated, for example. Part of proposed expansion area is the mousetrap where I-25 and I-70 intersect. I am not disputing the veracity of the author's claims about how our love of highways is/has been short-sighted, but until that commuter rail comes up north to my neck of the woods, I have to err on the side of public safety and agree to the I-70 construction.