A multi-car crash caused major traffic disruption at the Sydney Harbour Tunnel on Wednesday, September 30, with motorists warned to expect significant delays following the incident.

Emergency services were called to the tunnel after a man in his 50s reportedly suffered a medical episode while driving. His vehicle was involved in the crash, resulting in several vehicles being affected and the tunnel being temporarily closed while emergency crews responded.

Paramedics attended the scene and treated the man before transporting him to St Vincent’s Hospital. No other injuries were reported in connection with the crash.

The incident created substantial congestion, particularly for motorists travelling southbound through the tunnel. With the tunnel temporarily unavailable, traffic was redirected over the Sydney Harbour Bridge, adding pressure to surrounding roads and increasing travel times for commuters.

The Sydney Harbour Tunnel is an important transport link connecting the city's northern and southern areas beneath Sydney Harbour. Thousands of vehicles use the tunnel each day, meaning even a relatively short closure can quickly create significant congestion across surrounding roads.

Transport authorities advised motorists to allow extra time for their journeys and consider alternative routes while traffic conditions remained affected. Motorists approaching the area were encouraged to follow directions from traffic-management personnel and emergency services.

The tunnel has since reopened, but congestion remained an issue as traffic volumes built up following the closure. When a major road corridor such as the Harbour Tunnel is temporarily blocked, vehicles can quickly accumulate on alternative routes, particularly around the Harbour Bridge and approaches to the CBD.

The incident also highlights the risks associated with medical emergencies occurring while people are driving. A sudden medical episode can result in a driver losing control of a vehicle and create hazards for other motorists, particularly in confined environments such as tunnels.

Emergency crews must respond quickly to incidents inside tunnels because access can be more difficult than on ordinary roads. Tunnel operators and emergency services also need to manage ventilation, traffic movement and the safe removal of damaged vehicles before reopening the road.

Authorities have not reported any additional serious injuries from the crash. The circumstances surrounding the medical episode and the resulting collision remain subject to investigation.

For Sydney motorists travelling through the CBD and across the harbour today, the incident serves as a reminder to check current traffic conditions before beginning a journey. Even after a tunnel reopens, residual congestion can continue for some time as traffic gradually returns to normal.

The crash was reported on 30 September 2026, making it a today-only Sydney news story. It is also different from the previously supplied Sydney Airport safety investigation, so it is not a duplicate.