The protest on the M4 Severn Bridge is causing delays on the M48 Severn Bridge too, as motorists try to get back into Wales.
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Police say they're currently working with organisers and protestors who they estimate arrived in around ten vehicles to protest on the M4 Severn Crossing.
Gwent Police have told ITV News that they are trying to balance the rights of the protestors with that of the motorists as they deal with an ongoing demonstration westbound on the Severn Bridge:
There is traffic disruption on the M4 this afternoon due to a number of demonstrators protesting in the middle lane westbound of the Severn Crossing.
Gwent Police say officers are engaging with them to establish what their plans are.
Two lanes are closed and there's queueing traffic after an accident on the M4 Briton Ferry Bridge Eastbound between J42 (Earlswood Roundabout/Fabian Way) and J41 (Baglan/Pentyla).
There's congestion to J44 (Llansamlet).
It's also affecting the A465 at the M4 at J43 (Llandarcy), there's congestion to the A474 (Neath Interchange)
There's stop-start traffic after an accident, which is now on the hard shoulder on the M4 Eastbound between J25 A4042 / B4596 (Caerleon) and J24 A48 / A449 (Coldra).
All lanes have been re-opened.
There are long delays and stop-start traffic for nine miles after earlier flooding on the M4 Eastbound between J26 A4051 (Malpas Road) and J25A A4042 / B4596 (Newport/Grove Park Roundabout).
There's congestion to J32 A470 / A4054 (Coryton Interchange).
All lanes have been re-opened. It's also affecting the A48(M) outbound before the M4 at J29
There's disruption on First Great Western services between South Wales and London Paddington because of a signalling problem at Slough.
London Underground are accepting tickets for reasonable routes.
Tickets being accepted on via reasonable routes on other National Rail operator services.
Passengers are advised not to attempt to travel via this route. Disruption is likely to continue until around 10:00am.
There's queueing traffic for six miles because of earlier flooding on the M4 Eastbound between J26 A4051 (Malpas Road) and J25A A4042 / B4596 (Newport/Grove Park Roundabout).
There's congestion to J29 A48(M). All lanes have been re-opened.
The Met Office has issued a yellow 'be aware' warning of heavy rain and strong winds for coastal areas stretching from the Vale of Glamorgan to Anglesey.
The areas affected are:
- Isle of Anglesey
- Neath Port Talbot
- Vale of Glamorgan
Firefighters say trees have already been brought down in Newcastle Emlyn and Solva
And leaves are causing problems on roads between Haverfordwest and Newgale.
There are no reports of injuries.