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At rush hour on Friday March 22, around 100 protesters are gearing up to cause havoc on the M4 in protest at the potential delay to Brexit .

The 'Great British road block south Wales' is part of planned blockades across the UK in response to what organisers are calling a "Brexit betrayal".

Fishermen from Pembrokeshire are also getting behind the pro-Brexit protests by holding their own blockade of Pembroke Dock Ferry Terminal on Saturday, March 23.

Police and protesters arrive at Magor services ahead of the pro-Brexit protest:

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On Friday, the Welsh pro-Brexiteers plan to meet at Magor services at 6pm, before taking to the motorway to cause delays around the Prince of Wales Bridge.

They will drive slowly up the carriageway to create a rolling road block.

(Image: Carl Court/Getty Images)

The group is taking action against the threat of the country not leaving the EU on March 29 . The plan is to “bring this country to its knees” and it urged Brexiteers across the country to get involved.

The action takes place just a day after a Brexit petition calling for Article 50 to be revoked caused the Parliament website to crash .

Much of the coordination is being done via social media and WhatsApp. The 'Great British road block' national page said: "Dishonourable MPs blocked our freedom date of March 29 so we will start blocking planes, trains and roads."

Organisers of the south Wales protests said: "Whilst we appreciate that this event will cause some disruption, we firmly believe, weighted against why we are feeling obliged to take such action, that this is now our only course of action."

A spokesman for Gwent police said: "Gwent police will support Highways England who are responsible for keeping our road network moving. We will also deal with any unlawful obstruction or other motoring offences as they become apparent."

If the UK doesn't leave on March 29, the group say they will do it again "until our voice is heard".

In Pembrokeshire, where 57% voted to leave the EU at the referendum, two groups, Protest for Fishing Rights and Pembrokeshire for Brexit, have come together to do their bit to make sure Brexit goes through. They plan to block lorries coming out of the ferry terminal, but have said they will not block any public coming or going.

In February, it was reported that Pembrokeshire was the only Welsh county to put measures in place to deal with Brexit-related protest and disorder, with specialist police officers from Dyfed Powys Police on standby .

A spokesman for the force said: “We are aware of a planned protest and we will always seek to facilitate the right to peaceful protest, balancing the right to protest with disruption to local communities. We work with protest organisers to achieve this.”

(Image: Rhys Wonnacott)

Rhys Wonnacott from Protest for Fishing Rights said: “We want to have a clean break which will mean that EU boats won’t be given British quota,” he said. “At the moment the EU has three times more quota than us yet we fish the same ground.

"I got involved with the protest side of things so we would get treated fairly and that there would be an industry for years to come.”

Countdown to Brexit

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The protesters, who will be meeting at 11:40am, have been asked by organisers to wear hi-viz vests and bring union flags.

The news comes as the Welsh Government said that the UK Government’s temporary tariffs on imports, which would come into force in the event of a no deal Brexit, could see Welsh ports lose out .

A spokesperson for the Port of Milford Haven said: “We are responsible for the safe navigation and loading/unloading of the ferry. We are not involved in the onward journey of freight traffic once they leave the secure area of the ferry terminal. However, we are aware of the proposed action to prevent lorries from leaving Pembroke Dock.”