The northbound carriageway of the M1 has reopened.
A serious crash between two cars and a lorry closed the M1 between j11A for Flitwick and j13 in Bedfordshire for much of today.
An air ambulance landed at the scene and a subsequent police investigation has been ongoing.
All lanes on both sides of the carriageway are now open.
Anyone heading north out of Hertfordshire was faced with longer journeys and diversions, and drivers should be aware that the M1 remains slow approaching j13.
There were tailbacks for much of the day as a result of the closure.
It remains slow in sections - including between j12 and j13.
The motorway is getting busier too northbound, further south, approaching j9 for Redbourn.
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