A section of the M1 was closed after a serious accident.
The motorway was closed between junction four, in Edgware, and junction 2, Fiveways Corner, southbound. It has been partially reopened and only one lane is open northbound.
A witness in a two-hour tailback said a badly damaged car lay overturned on the fast lane of the northbound carriageway.
The closure is causing gridlock on sliproads on to the M1.
More to follow...
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