Adequate? You've gotta be kidding. Austin is literally the only large metro area in the United States with a MSA population of over 2 million people that is not served by both North-South and East-West super highway corridors. But you insist on diverting any East-West Interstate corridor development to an area with a comparatively TINY population. That's completely nuts.
If ordinary 4-lane divided non-freeway routes are good enough to serve East-West movements thru Austin we might as well down-grade I-10 thru San Antonio. The Austin metro is just as populous as the San Antonio metro and the city limits population of Austin is growing faster than San Antonio. If the current trend holds Austin will pass San Antonio in city limits population.
I-10 between San Antonio and Houston at its lowest point has 33,500 AADT, we can assume that's an average volume for metro to metro traffic.
SH-71 between Austin and I-10 at its lowest point has 11,900 AADT.
US-290 between Austin and Houston at its lowest point has 12,500 AADT.
Poor comparison between I-10 and SH-71 / US-290, significantly more traffic.
I'm not saying there should be no improvements to the two corridors. The freeways should continue to be extended east as the region grows outward, and the remaining towns on the corridors should be bypassed. Once a 65 - 75 mph divided highway with zero traffic signals is established, the corridor would be more than adequate. In the long term, a freeway would be ideal, but is not a necessity at this point.
If the two corridors were combined to one roadway, presumably they would carry around 24,000 AADT, and even then a 4 lane divided 65 - 75 mph expressway with zero traffic signals and town bypasses would be adequate with a freeway the long-term vision.
US-190 does have a crooked zig-zag route through the Texas Triangle. The US-290 and TX-71 corridors between Austin and Houston are far more direct than that even with the bypasses around towns[/b]. Some of those bypasses are already freeways. US-290 and TX-71 don't run on a "W" shape or saw-tooth shape like US-190. Both corridors would be relatively easy to upgrade. And both corridors are direct links between two metros that are in the top 10 of the nation's largest metros. I don't see how Killeen trumps that.
First off, the
current US-190 corridor is a zig-zag. The proposal for I-14 would generally follow this, but in an alignment that is significantly straighter.
US-190 between Temple and College Station at its lowest point has 7,800 AADT, not much less than the Austin - Houston corridors. The College Station / Bryan metro of 270,000 population has 4 lane divided highways going to Austin, Houston, and Waco. They lack 4 lane access to the Killeen / Temple / Fort Hood metro of 460,000 along with to Huntsville of 40,000. Because of its crooked alignment, a 4 lane divided highway would likely be built on new location on a straight alignment, avoiding the towns in the process, and you have I-14.
The US-190 / Future I-14 corridor is more inadequate than US-290 or SH-71 are, and rightfully is a higher priority.