Lanes three and four of the M4 have been closed by the poilice after a crash.
The junction 16 westbound slip-road was closed but has since been reopened.
Traffic is building towards junction 15 as well as down Great Western Way.
The police have confirmed that there is an ongoing incident.
Highways England tweeted that the slip-road had closed and re-opened before confirming that the two lanes were now closed.
It said: "M4 Westbound J16 Swindon exit slip is open.
"Lanes 3 and 4 will remain closed.
"We shall update once the lanes are back open."
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