One lane has been closed on the M1 near junction 25 for emergency repairs.
Highways England is repairing a section of the M1 after the discovery of a collapsed manhole cover on the northbound carriageway.
The road remains open with two lanes running past the scene but drivers are encouraged to allow extra time for their journeys when travelling through the area.
Full repairs will take place tonight after 9pm when traffic flows are lower. The M1 will be fully closed northbound at junction 25 with traffic able to re-join at junction 25a.