Police were called shortly after 2pm on Tuesday (Jan 2) to the M62 east bound, just before the exit slip road for Junction 25 following a concern for safety after an articulated skip wagon was reported to have been stationary at the location with its engine running.
On attendance, officers found the body of a man is his forties, the driver of the vehicle, on the embankment nearby. He was treated by paramedics but pronounced deceased at the scene.
The family of the deceased have been informed.
Police are appealing for anyone who may have been travelling along the M62 east bound and has seen an articulated skip wagon pulling up ahead of the slip road, the driver exiting the vehicle, or who has seen the vehicle travelling along the carriageway prior to 11.25am.
Equally, officers would like to hear from any drivers travelling along the section of motorway with dash cams who may have captured the vehicle travelling, or stationary and would ask those motorists also come forward.
Officers are working to determine the circumstances of what took place but there is not believed to be any third party involvement at this time.
Anyone with any information should contact Calderdale CID via 101 quoting log 820 of January 2.