You could be right, exceedingly hard to tell.  Last I knew DOT had at least 3 "notions" on what Dowling Interchange might be - properly designed roundabouts, standard signalized and some kind of hybrid signalized.  Digging into the STIP program shows a cluster of projects,  Link is http://dot.alaska.gov/stwdplng/cip/stip/assets/STIP.pdf for the doc,  Page 43 of ~350, Need ID: 29730 describes a project for the roundabouts but is vague and has errors like the wrong 2013 Election District.  Key will be whether or not the overpass is replaced; the current one is not up to standard which is why the current kluge roundabout is in place.  I am getting a distinct impression this whole thing is being done on the cheap.  What can possibly go wrong!