M4 tunnel chaos traps Sydney drivers

Table of Contents

• The overnight discovery of roof cracks sparked hours-long gridlock and safety concerns
• What happened, where and when
• Response from officials and operators
• Immediate impacts and practical advice for drivers
• Why communication matters
• Key takeaways
• FAQs

The overnight discovery of roof cracks sparked hours-long gridlock and safety concerns

The M4 tunnel became the epicentre of a major traffic crisis after cracks and bulges were discovered during overnight roadworks, leaving motorists trapped for up to four hours. The closure and partial openings sparked fury from drivers who say entrances remained open while cars continued to funnel into the affected section.

The issue emerged just after 5am when workers identified alarming bulges in the westbound tunnel roof. Instead of an immediate full closure, operators kept some entrances open and motorists continued to enter, creating a severe bottleneck that stretched both below ground and across surface roads.

Drivers reported being stuck in crawl‑space traffic for hours. Some abandoned vehicles amid fears of roof collapse, while others raised the alarm that an ambulance was also caught in the jam with its lights on. The situation heightened public anxiety about both immediate safety and operational decision‑making by the tunnel operator.

What happened, where and when

Cracks and bulges were found during scheduled overnight maintenance on the M4 westbound tunnel. The affected stretch remained closed from Haberfield to Homebush, but several entrances were left open, allowing vehicles to enter before lanes were fully cordoned off.

Commuters faced long diversions across Parramatta Road and surrounding arterials. People heading to urgent appointments and funerals reported extended travel times and missed commitments as congestion spread above ground.

Response from officials and operators

State officials said consultant engineers were called in immediately and the affected area was isolated while assessments were carried out. The roads minister described the events as “clearly unacceptable” and criticised the tunnel operator’s communication with the public.

“The communication here has not been good enough.”

Transurban has apologised and confirmed a comprehensive review will follow. Meanwhile, authorities advised motorists to avoid the tunnel and offered toll refunds to affected customers.

“If you ask me that question, I need more assurance.”

That comment from an official reflected broader concern about being able to guarantee the immediate structural integrity of the roof until engineers completed their inspections.

Immediate impacts and practical advice for drivers

• Expect delays on routes feeding the M4 and on surface arterials while the westbound tunnel remains closed.
• Consider alternative routes and leave extra travel time for essential trips.
• Keep an eye on official traffic alerts and operator updates before you travel.
• If you were charged a toll while trapped in the closure, you can apply for a refund through the operator’s customer service channels.

Motorists should avoid using the M4 tunnel until authorities confirm more lanes can safely reopen. The operator indicated hopes that additional lanes and a more permanent repair could be in place by the following day, but urged patience while safety checks continue.

Why communication matters

Beyond the engineering work, this incident highlights a recurring challenge for privately operated infrastructure: balancing ongoing maintenance with real‑time public safety and information. Leaving entrances open during a structural alert undermined confidence and worsened congestion.

Officials have committed to a review of decision‑making and messaging protocols to prevent similar disruption in future and to ensure safety is prioritised over traffic flow or toll collection.

Key takeaways

• Cracks and bulges found in the M4 westbound tunnel led to an extended closure and major delays.
• Some drivers were trapped for hours and others abandoned vehicles amid safety fears.
• Consultant engineers isolated the affected area; full safety assurance awaits their assessment.
• Transurban has apologised and toll refunds are available for those impacted.
• Drivers are advised to avoid the M4 tunnel until officials confirm lanes are safe to reopen.

FAQs

Why was the M4 tunnel closed?

Cracks and bulges were discovered in the westbound tunnel roof during overnight roadworks, prompting engineers to isolate the affected area and close lanes for safety inspections and repairs.

Which section of the M4 is affected?

The closure affected the westbound tunnel between Haberfield and Homebush, with impacts spreading to surface roads and local arterials as traffic was diverted.

Can I get a refund for tolls charged during the incident?

Yes. The operator has advised that drivers who were charged while trapped can apply for a toll refund through the operator’s customer service process.

Is it safe to use other Sydney tunnels now?

Authorities recommend avoiding the M4 tunnel until engineers confirm stability. Other tunnels remain subject to routine checks; always follow official traffic updates and official safety advice before travelling.

The information in this article has been adapted from mainstream news sources and video reports published on official channels. Watch the full video here Sydney tunnel chaos traps drivers for hours | 7NEWS