Two cars have crashed on the M1 heading northbound for the M1 and M621 split.
The cars are in lane four of six.
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Highways England tweeted this update: "#M1 Northbound J43 for #M1 #M621 split. 2 vehicle RTC in lane 4 of 6 lane section.
"#TrafficOfficers on scene with @WYP_RPU. Heavy congestion in the area and on approach northbound. Please take care in passing."