Drivers are being urged to expect delays and plan ahead after a serious collision on the A27 westbound resulted in a full carriageway closure between the A293 (Portslade) and the A270 (Shoreham) near the Southwick Tunnel.

The incident, which involved three vehicles, has led to significant disruption, with emergency services attending the scene. The full extent of injuries or damage is currently unknown.

As a result of the collision, traffic is being diverted via a Hollow Triangle diversion route:

• Exit the A27 at the Hangleton Interchange onto the A293 southbound.
• Continue to the junction with the A270, then head westbound.
• Rejoin the A27 at the Holmbush Interchange.

Drivers are advised to allow extra time for their journeys, consider alternative routes, or delay travel if possible.

Further updates and real-time travel information are available via www.trafficengland.com, through travel apps, or by checking National Highways’ regional X (Twitter) feed.

Motorists are urged to stay alert for changing traffic conditions and to follow local signage for the diversion route.