Long delays on M4 after crash that closed two lanes
Traffic cameras showed large tailbacks early on Monday morning.
Wales M4 Motorway
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Twelve arrested during M4 fuel protest for driving slower than 30mph
Gwent Police warned protesters that it was aware of "driving offences" being committed during the fuel protest.
Police warn of 'serious disruption' as protesters plan M4 road block
Protesters intend to block the Prince of Wales Bridge from 7am until 7pm on Monday as part of a nationwide campaign against rising fuel prices.