“Diversions are in place and the closure is likely to be in place for several hours.”
It was closed between junction 23, Outlane, and junction 22 at Rishworth, west Yorkshire.
Vehicles were turned round in the opposite direction as traffic builds up.
The motorway was re-opened around midday in both directions after the incident.
Drivers were advised to allow extra time to complete their journeys or find alternative routes.