San Antonio, Texas, December 27, 2025
San Antonio is gearing up for significant roadway enhancements along the I-35 corridor, including the I-35 NEX South Project, which is set to add new lanes to ease traffic congestion. Other projects such as the Capital Express South Project and the SH 130 Expansion Project will also contribute to improved mobility. With a total funding of over $1.5 billion, these initiatives aim to enhance safety and reduce travel times for commuters.
San Antonio, Texas
San Antonio is set to undergo significant infrastructure improvements in 2026, with several major construction projects planned for the I-35 corridor. These initiatives aim to alleviate traffic congestion, enhance safety, and improve mobility for commuters and residents alike.
I-35 Northeast Expansion (NEX) South Project
Fluor Corporation has been awarded a $700 million contract for the I-35 NEX South Project, which is scheduled to commence in early 2026 and is expected to be completed in 2028. This project will add three elevated lanes—two mainlanes and one high-occupancy vehicle (HOV) lane—in each direction over approximately four miles of the I-35 corridor. The expansion is anticipated to reduce current travel times by half for the 140,000 daily commuters who utilize this stretch of highway. The project is part of a broader $3 billion budget allocated for I-35 improvements in Texas.
Capital Express South Project
The Capital Express South Project, with an estimated cost of $548 million, is currently under construction. This initiative focuses on adding lanes, reconstructing bridges, and improving interchanges along the I-35 corridor in the southern region of Austin. The project aims to enhance traffic flow and safety for the growing number of commuters in the area.
SH 130 Expansion Project
In addition to the I-35 projects, the Texas Department of Transportation (TxDOT) has planned the SH 130 Expansion Project, which involves adding one lane in each direction from SH 45N to I-35. This $250 million project is expected to begin in fiscal year 2027 and be completed by 2031. The expansion aims to accommodate increased traffic due to regional growth and developments such as the Samsung Austin Semiconductor in Taylor.
Background Context
The I-35 corridor is a critical transportation route in Texas, serving as a major artery for both local and interstate traffic. Over the years, the highway has experienced significant congestion, leading to the need for extensive upgrades and expansions. These projects are part of TxDOT’s long-term plan to address the area’s growing mobility needs, improve safety, and enhance the overall driving experience for all users.
As these projects progress, residents and commuters are encouraged to stay informed about construction schedules and potential traffic disruptions. TxDOT provides regular updates and resources to assist the public in navigating these changes effectively.
Key Features of the I-35 Construction Projects in 2026
| Project Name | Location | Scope of Work | Estimated Cost | Estimated Completion |
|---|---|---|---|---|
| I-35 NEX South Project | San Antonio, Texas | Add three elevated lanes (two mainlanes and one HOV lane) in each direction over approximately four miles of I-35 | $700 million | 2028 |
| Capital Express South Project | Austin, Texas | Add lanes, reconstruct bridges, and improve interchanges along the I-35 corridor in the southern region of Austin | $548 million | Under Construction |
| SH 130 Expansion Project | Williamson/Travis Counties, Texas | Add one lane in each direction from SH 45N to I-35 | $250 million | 2031 |
FAQ
What is the I-35 NEX South Project?
The I-35 NEX South Project is a $700 million initiative awarded to Fluor Corporation, scheduled to begin in early 2026 and complete in 2028. It involves adding three elevated lanes—two mainlanes and one high-occupancy vehicle (HOV) lane—in each direction over approximately four miles of the I-35 corridor in San Antonio. The project aims to reduce current travel times by half for the 140,000 daily commuters who use this stretch of highway.
What is the Capital Express South Project?
The Capital Express South Project is an estimated $548 million initiative currently under construction. It focuses on adding lanes, reconstructing bridges, and improving interchanges along the I-35 corridor in the southern region of Austin. The project aims to enhance traffic flow and safety for the growing number of commuters in the area.
What is the SH 130 Expansion Project?
The SH 130 Expansion Project involves adding one lane in each direction from SH 45N to I-35. This $250 million project is expected to begin in fiscal year 2027 and be completed by 2031. The expansion aims to accommodate increased traffic due to regional growth and developments such as the Samsung Austin Semiconductor in Taylor.
Why are these projects necessary?
The I-35 corridor is a critical transportation route in Texas, serving as a major artery for both local and interstate traffic. Over the years, the highway has experienced significant congestion, leading to the need for extensive upgrades and expansions. These projects are part of TxDOT’s long-term plan to address the area’s growing mobility needs, improve safety, and enhance the overall driving experience for all users.
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