Two police cars, an ambulance and a fire engine were spotted at the scene on the M1 motorway at the point where the M1 splits into the M621, at M1 junction 43 northbound.
A car was left on its side on the grass verge by the edge of the motorway.
The incident was first reported at about 9.10am.
It is not thought to have significantly affected traffic due to congestion conditions being light on a Sunday morning.
More news on this incident as we get it.