Round Rock Police diverting visitors after multi-vehicle crash on I-35

Introduction

The Round Rock Police Department announced an immediate traffic diversion on southbound Interstate 35 following a serious multi‑vehicle crash near the intersection of RM 1431 and University Boulevard. The incident, which occurred early on the morning of December 17, 2025, has prompted authorities to reroute commuters, alert local businesses, and coordinate with the Texas Department of Transportation (TxDOT) to restore safe highway conditions. This article provides a comprehensive, SEO‑optimized overview of the event, its context, the response actions taken, and practical guidance for drivers and residents.

Key Points

What happened?

According to the official press release issued by Round Rock Police, a chain‑reaction collision involving at least five passenger vehicles and a commercial truck blocked the southbound lanes of I‑35 near the RM 1431/University Boulevard interchange. Preliminary investigations indicate that a sudden deceleration in traffic, likely caused by a construction zone, led the lead vehicle to brake abruptly, triggering a rear‑end impact that propagated forward. The crash resulted in multiple injuries, several of which were classified as serious, and caused extensive vehicle damage.

Where did it happen?

The collision occurred on the southbound side of Interstate 35, approximately 0.8 miles south of the RM 1431 (Lake Travis) exit and just north of University Boulevard. This segment of I‑35 is a major commuter corridor connecting the Austin metropolitan area with central Texas communities, including Cedar Park, Leander, and Georgetown.

When was the information released?

The incident was reported at 04:21 a.m. Central Standard Time on December 17, 2025. Within minutes, the Round Rock Police Department activated its emergency traffic management protocol and began publishing updates on its official website and social media channels.

Background

About Interstate 35

Interstate 35 (I‑35) is a north‑south federal highway that stretches from Laredo, Texas, near the Mexican border, to Duluth, Minnesota. Within Texas, I‑35 serves as a critical artery for both freight and passenger traffic, linking the state’s major economic hubs. The stretch passing through Round Rock is characterized by high traffic volume, frequent construction activity, and a mix of urban and suburban roadways.

Round Rock Police Department

The Round Rock Police Department (RRPD) is the primary law‑enforcement agency for the City of Round Rock, Texas. Established in 1991, the department employs over 250 sworn officers and civilian staff. RRPD’s responsibilities include public safety, traffic enforcement, criminal investigations, and emergency response coordination with regional agencies such as the Texas Department of Public Safety (DPS) and local fire departments.

Analysis

Traffic flow impact

The multi‑vehicle crash created an immediate bottleneck on southbound I‑35, forcing TxDOT to close the affected lanes while emergency crews cleared debris and tended to the injured. According to TxDOT’s real‑time traffic management system, the closure generated a backup extending over 3 miles, affecting commuters during the peak morning rush hour. Detour routes were established using adjacent arterial roads, including RM 1431, University Boulevard, and Old Settlers Boulevard, to guide displaced drivers toward alternative interchanges.

Emergency response protocols

RRPD’s response followed the standard “Incident Command System” (ICS) framework mandated by the Federal Highway Administration (FHWA). First responders — including Round Rock Firefighters, Austin-Travis County EMS, and Texas DPS officers — secured the scene, provided medical assistance, and documented evidence for later accident reconstruction. The coordinated effort ensured that lane closures were maintained safely and that traffic information was disseminated promptly to the public.

Practical Advice

For commuters

Drivers who normally travel southbound on I‑35 through the affected area are advised to:

• Check real‑time traffic updates on the TxDOT website or mobile app before departure.
• Consider alternative routes such as RM 1431 north to Lake Travis Boulevard, then east on Old Settlers Boulevard to reconnect with I‑35 at the Hill Country Boulevard interchange.
• Allow extra travel time — estimates suggest an additional 15‑20 minutes may be required during the initial clearance phase.
• Avoid distractions and maintain a safe following distance, especially when navigating temporary detour signage.

For travelers and tourists

Visitors unfamiliar with the local roadways should:

• Use a GPS navigation system set to “avoid highways” or “avoid tolls” if they prefer surface streets.
• Consult posted signage for detour markers; these are typically illuminated and accompanied by temporary speed limits.
• Stay informed about potential lane reopenings by listening to local radio stations or checking the Round Rock Police Department’s official Twitter feed.

FAQ

Conclusion

The multi‑vehicle crash on southbound Interstate 35 near Round Rock highlights the vulnerability of high‑traffic corridors to sudden incidents and the importance of coordinated emergency response. The swift action taken by the Round Rock Police Department, in partnership with TxDOT and regional first‑responder agencies, has minimized further risk to the public while ensuring that affected drivers receive timely information and safe detour options. Commuters are encouraged to stay vigilant, follow official guidance, and monitor traffic updates until normal flow is restored. By understanding the procedural steps and practical implications of such events, road users can navigate disruptions more safely and efficiently.