FRONTAGE ROADS SUCK
Without the frontage roads and ancillary suburban metastasis, this interchange could have been upgraded in many different ways which would have been far cheaper and far quicker than the 5-level spaghetti bowl we’re ending up with here. Other states build freeways mostly without frontage roads, which also destroy the ability of pedestrians, bicyclists, and transit users to actually get anywhere.
The argument in Texas is usually that access to existing properties must be preserved – which flies in the face of reality considering that when most of these roads are upgraded to freeways (long before interchange debacles like this one), most of the strip malls don’t exist. On the rare occasions when access to existing properties simply must be preserved, other states do so either by shorter sections of frontage roads (noncontinuous) or by perimeter roads (examples along US101 in Santa Clara spring to mind). Neither of those choices, of course, allows the guys who own the land next to the freeway to cash in quite as readily.
Ironically, most Texans, when asked, seem to prefer these stupid things. While I can understand the layperson not getting it, it’s pretty hard to understand how responsible leaders in our area outside TXDOT’s cronysphere continue to support them, given the repeated examples of intersections which completely fail at moving traffic due to the stripsprawl their frontage roads generated (Braker/183, for instance, or Parmer/Mopac).
(Note to self: remember to write item about frontage road highway design severing existing connections across US 183, esp. northwest Austin).