UPDATE 12:38pm
A Gwent Police spokeswoman said: "Police were called at 10.03 this morning regarding an RTC on the M4 between junction 28 and 29.
"Five vhicles were involved, no injuries were sustained.
"The motorway is now clear."
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ONE LANE is closed on the M4 in Newport following a crash this morning.
Four cars were involved in the crash which is now on the hard shoulder.
Very slow traffic is reported eastbound between J29 A48(M) and J28 at Tredegar Park, because of the crash.
Congestion is stretching to J30 at Cardiff Gate.
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