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Think traffic on Mopac is bad now?  Imagine adding 30,000 more car trips per day!

Take a minute to consider how building an “Outer Loop” would impact Mopac and the region.

Currently, Mopac functions as a local commuter highway. All of that changes if the southern end of Mopac is connected to FM 1626 and I-35 by way of the proposed “State Highway 45 Southwest.” SH 45 SW, a remnant of TxDOT’s ill-conceived “Outer Loop” around Austin, is the last we thing we need to spend local money on.

Building out SH 45 SW as a non-tolled highway connecting to I-35 would put another 30,000 cars on Mopac every day, according to an estimate from the regional transportation planners.

Linking South Mopac to FM 1626 and I-35 via an “outer loop” around Austin hurts every single current Mopac commuter. Only developers and some commuters in Hays County and long-distance haulers will see any significant benefit. Their gain will be our pain . . . and we get to pay for it!

Making the “loop” on South Mopac means exposing neighborhoods to increased pollution and traffic. Paving the Barton Springs Edwards Aquifer recharge zone. Putting a highway through significant caves and endangered species habitat. Enabling sprawl development that will reduce available water supplies and open space. And robbing limited transportation funds from much higher priority local transportation needs.

Just say “No Thank You!!”
to an Outer Loop for Mopac.

Send one message today to Austin and Travis County officials and tell them to protect Mopac commuters, Mopac corridor neighborhoods, and the Barton Springs Edwards Aquifer. Tell your friends and family to do the same.

Mopac was built for Austin commuters.
Let’s keep it that way!



Tell TxDOT to Study and Build Alternatives to SH 45SW and Proposed Mopac Freeway Intersections

TxDOT and the local toll road authority (“CTRMA”) are pressing ahead with 3 separate environmental studies and required public input processes: one on the proposed 45 SW; one on a proposal to build the freeway main lanes and overpass bridges at Mopac and La Crosse and at Mopac and Slaughter; and the third one on expanding South Mopac north of Slaughter all the way to Cesar Chavez, north of the Colorado River by adding up to two additional tolled lanes in each direction.

TxDOT’s website for the “intersections” study and South Mopac study is at The website for the revived 45SW proposal is at Comments may be made on these studies, at any time, at the “contact” button at the top of each website.


Zombie Aquifer Toll Road is BAAACK!

Just tell them “No more traffic on Mopac!”

You can send in comments now through October 18 at this link. This is only the beginning of a new “state” Environmental Impact Study process, but it is important to tell the CTRMA now that: 1) There is no such thing as a green toll road over the recharge zone for Texas’ most vulnerable aquifer; 2) There should be no more traffic on Mopac (TxDOT’s own analysis shows that if built the road would dump up to 30,000 more cars per day on South Mopac); and 3) Commuters from eastern Hays county should never be diverted to the west, on top of the aquifer and onto an already overcrowded Mopac.



The Latest Truths and Mysteries  About Our Least Favorite Proposed Toll Road


South Mopac Neighbors' Alliance

For more information and daily updates, please visit the South Mopac Neighbors' Alliance Facebook page.

In the News


Animation showing how SH45 SW will affect the Lady Bird Johnson Wildflower Center and surrounding area.             view larger version