UPDATE 8.15pm

All lanes have now re-opened.

UPDATE 7pm

This incident is still ongoing, with cameras showing that traffic is heavy. 

South Wales Argus:

6pm

TWO lanes are closed on the M4 after a lorry carrying a tractor has struck a bridge.

The lane closure, between Junction 24 and Junction 23A eastbound, is affecting traffic heading away from Newport, causing queueing traffic.