Long delays on M1 after crash

There are seven miles of delays on the M1 after a crash.
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Highways England has said that there is currently 45 minute delays between J21a and J21.

One lane is closed and an extra lanes has been opened.

A Highways spokesman said: "There are 45 minute delays on the approach to this M1 collision spanning approx. 7 miles back to J22."

UPDATE: "Traffic has returned to normal now, all lanes open."