Dallas Fort Worth Urban Forum

At Fitzhugh, I-30 bends to head for the Trinity, but if it had tunneled under the river instead, the route might have had other options. If we imagine a new right of way, a 10,000-foot tunnel would feed the eastern end of Woodall Rodgers. And if it continued another 1.25 miles underground, it could be a direct express route from both 183 Texpress and DNT. What do you think?
And inset:

A tandem, West Dallas tunnel would be capable of linking Woodall Rodgers to I-30 on its other end as well...

and unless its exits are too closely spaced to meet Interstate Highway System standards, it would become a completed auxiliary interstate, which as a bypass would be signed I-230, 430, 630 or 830. This would offer direct US75 and DNT access to eastbound people without having to pass thru the mixmaster.

https://en.m.wikipedia.org/wiki/List_of ... ays#Bypass

We can imagine a future, however, in which this bypass was so useful that it became the route of choice. It inspires someone to propose reuniting the Deep Ellum and Fair Park neighbors with a teardown campaign for Old I-30 between Schepps and Fitzhugh, and at that point, this bypass would become simply I-30. The piece of I-30 separating the Cedars from Downtown, by contrast, would become I-145.

I45Tex wrote:We can imagine a future ... teardown campaign for Old I-30 between Schepps and Fitzhugh, and at that point, this bypass would become simply I-30. The piece of I-30 separating the Cedars from Downtown, by contrast, would become I-145.

An alternative outcome in that same scenario would be for the aforementioned piece to bring I-45 just west to the Dallas Horseshoe Interchange (2013-2017) formerly known as Dallas Mixmaster (1964-2016). It would then not be a spur but the mainlanes, interchanging as normal with I-35. Via the McDermott Bridge, I-45 would continue across the river to terminate at I-30 again, at a new junction where it met the West Dallas I-30 tunnel west from Margaret Hunt Hill Bridge.

https://www.millcreektunnel.com/project-overview

Since we already have the giant 30-foot-in-diameter TBM machine in the ground and we already have detailed analysis of the geotechnical conditions in the path of the Mill Creek Tunnel, why not just use it to make another lap?

Or even an underground collector ellipse?