Wellington's Terrace Tunnel has reopened after a crash this afternoon.
Police were called to a two-vehicle collision around 4:40pm this afternoon.
"Early indications are a person may have suffered a medical event," a Police spokesperson said.
One person has been taken to hospital.
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The southbound lane was initially closed, with northbound traffic down to one lane.
Motorists should expect delays and avoid the area if possible, police said.