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