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[kernals12]

With much less controversy than in Austin, TxDOT is undertaking a massive expansion of I-35 in San Antonio. They're double decking 10 miles of it northeast of I-410 with 3 non-tolled express lanes in each direction. The groundbreaking ceremony was held today and construction on the $1.5 billion project will last until 2027.



Combined with the widening of Loop 1604 from 4 lanes to 10, San Antonio is really going agro on its traffic problems.

It does beg the question though of why they can't do this for I-45 in Houston

[Plutonic Panda]

Is this considered “double decking?” To me they’re just adding elevated express lanes. Double decking would technically be placing a deck over the existing highway.

Either way this is an excellent project. I wish they’d do this on US-101 from downtown LA to Topanga Canyon.

[sprjus4]

https://www.aaroads.com/forum/index.php?topic=24909.0

[longhorn]

[kphoger]

Is this considered “double decking?” To me they’re just adding elevated express lanes. Double decking would technically be placing a deck over the existing highway.

Either way this is an excellent project. I wish they’d do this on US-101 from downtown LA to Topanga Canyon.

Aren't the elevated structures going to be "a deck over the existing" frontage roads?

[jgb191]

Is this considered “double decking?” To me they’re just adding elevated express lanes. Double decking would technically be placing a deck over the existing highway.

Either way this is an excellent project. I wish they’d do this on US-101 from downtown LA to Topanga Canyon.

Yeah it's still considered a double-deck because the elevated lanes will still fly directly above the ground lanes.  The difference between this and the original double deck sections of I-10 between downtown and I-410 is that the upper level of the upcoming I-35 section is limited exclusively to express traffic (nonstop from downtown to the county line) and lower levels are for local traffic who intend to enter the freeway and exit after a short distance.  The original sections on I-10 had on and off ramps from both levels.  Also the original I-10 eastbound and westbound upper levels are closer apart (if you flew over it in a helicopter, you couldn't easily see the lower level); whereas on the new I-35 section there will be a considerably wider gap between the northbound and southbound upper levels that will expose the lower level even from a birds-eye view.