Car Accidents
18-Wheeler Crash Shuts Down Lower Level of I-35 in San Antonio

This commentary is based on local news reporting. For complete details about this incident, please read the original article linked below. The information provided here is for educational purposes and does not constitute legal advice.
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This commentary is based on reporting from My San Antonio. Click below to read the complete original article.
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A major crash involving an 18-wheeler shut down part of southbound I-35 near downtown San Antonio early Friday morning, September 4, 2026.
The collision occurred at approximately 5:44 a.m. on the southbound lower level of I-35, between Cesar E. Chavez Boulevard and Spur 536 near Exit 155.
Drivers were being urged to avoid the lower level while crews worked to clear the scene and use the upper level when possible.
Early information did not confirm how many vehicles or people were involved or whether anyone was injured.
Southbound I-35 Lower Level Closed Near Downtown San Antonio
The 18-wheeler crash caused significant traffic problems during the Friday morning commute.
The wreck occurred in a complicated section of the interstate near downtown San Antonio, where drivers encounter upper and lower roadway levels, entrance and exit ramps, and traffic traveling toward surrounding downtown streets and highways.
Motorists traveling south on I-35 near Cesar Chavez Boulevard, downtown San Antonio, and the Spur 536 interchange could experience substantial delays while emergency crews clear the collision.
Because the investigation remains preliminary, it would be premature to determine whether speed, distraction, following distance, an unsafe lane change, mechanical failure, or another factor caused the wreck.
What Evidence Matters After a San Antonio 18-Wheeler Crash?
A serious commercial truck collision on a major interstate can involve evidence held by the truck driver, motor carrier, and other parties.
Potentially important evidence may include:
Electronic control module or “black box” data
Electronic logging-device records
GPS and telematics information
Forward-facing and driver-facing camera footage
Driver hours-of-service records
Dispatch communications
Tractor and trailer inspection records
Brake and tire maintenance records
Traffic-camera footage
Dashcam video from other vehicles
Witness statements
Photographs and measurements from the crash scene
The Wooley Law Firm represents people injured in Texas 18-wheeler and commercial truck accidents, including serious highway crashes throughout San Antonio and across Texas.
Why an I-35 Truck Crash Near Downtown Can Be Complicated
The downtown San Antonio section of I-35 contains multiple ramps, elevated roadways, split roadway levels, and traffic moving between major routes.
After a truck wreck in this area, investigators may need to determine which lane the tractor-trailer occupied, whether traffic had slowed, whether the truck was changing lanes, and whether the driver had enough time and distance to avoid the collision.
The final position of a truck after a crash does not necessarily establish how the collision began.
Trucking Company Records May Need to Be Preserved
If someone was injured in the September 4 crash, evidence held by the motor carrier could become critical.
Records worth investigating may include the truck driver's qualification file, electronic logs, GPS history, onboard camera footage, dispatch messages, pre-trip inspections, maintenance history, and electronic vehicle data.
Some electronic evidence can be overwritten during normal business operations. Prompt preservation can therefore be important after a serious commercial truck collision.
Other I-35 18-Wheeler Crashes in San Antonio
The Wooley Law Firm has reported on other serious commercial truck crashes along I-35 in San Antonio, including an 18-wheeler crash that shut down southbound I-35 at Loop 1604, a San Antonio I-35 construction-zone truck crash, and a fatal crash involving an SUV and an 18-wheeler on I-35.
Those collisions involved different circumstances and are not known to be related to Friday morning's downtown crash.
Injured in an 18-Wheeler Crash on I-35 in San Antonio?
If you were injured in a San Antonio 18-wheeler accident, I-35 truck wreck, downtown San Antonio collision, Cesar Chavez Boulevard crash, or another serious Bexar County commercial vehicle accident, you may have the right to seek justice and pursue compensation if another person or company was legally responsible.
A San Antonio truck accident lawyer can investigate electronic truck data, onboard cameras, driver records, maintenance history, traffic-camera footage, witness statements, and available insurance coverage to determine how the crash occurred.
Depending on the circumstances, an injured person may be able to pursue compensation for medical expenses, pain and suffering, lost wages, mental anguish, physical impairment, property damage, and other losses.
Call The Wooley Law Firm at (214) 699-6524 for a free consultation. You don't pay unless we win.
This article is based on preliminary traffic information concerning a developing September 4, 2026 commercial truck collision. Additional or different facts may become available. Nothing in this article is intended to assign fault to the truck driver, motor carrier, another driver, or any other person or company before the investigation is complete. This article is for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship.
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This summary is based on reporting from My San Antonio. For complete details, visit the original article.
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Read CommentaryDisclaimer: The information on this page is for general educational purposes only and does not constitute legal advice. Wooley Law monitors publicly available news sources and provides independent commentary on accident law and safety topics relevant to the Dallas-Fort Worth area. Any summaries or references to news stories are based on publicly reported information and may not reflect the full facts of any case. Wooley Law is not affiliated with the individuals or parties mentioned unless explicitly stated. If you have been injured in an accident, please consult with a qualified attorney regarding your specific legal situation.
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