A SERIOUS accident has taken place between Neyland and Milford Haven.
Witnesses said they saw a man being treated at the side of the road, and police and ambulance crews.
Wales Air Ambulance was also at the scene, and has just taken off.
The accident has occurred between Sentry Cross/Jordanston and Honeyborough Roundabout.
According to traffic reports, the A477 is closed both ways, with traffic moving slowly.
Police are understood to be at the scene, and current information is that the road is likely to remain closed until this afternoon as the vehicle is recovered.
Diversions are in place via Mastlebridge/Little Honeyborough.
A witness near the scene said they hadn’t heard or seen the collision but noticed traffic slowing outside their home.
“My husband said it had to be an accident," she said.
"We went out and could see a car which seems to have gone through the hedge.
"There were then lots of police and ambulance and we could see a man being treated before being placed in the helicopter.”
A police spokesman said: “Dyfed-Powys Police is at the scene of a serious RTC between the Sentry Cross and Honeyborough roundabouts, Pembrokeshire.
"The A477 stretch between those roundabouts is currently closed while emergency services deal with the incident.
"One car is involved; the driver has received serious injuries.
"No further information is available at this time.”
UPDATE: 12.30pm: the road has now re-opened.
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