Robert Ashton is thought to have gone missing in the Ranby area.
The 55 year old was last seen leaving his daughter’s home in Great Harwood, in Blackburn, on the evening of Friday 5th June.
His car was found on the north-bound hard shoulder of the A1 close to Ranby early on Sunday morning and police are concentrating the search in that area.
Robert is white, of a stocky build and about 6ft tall. He has grey, balding hair. He is thought to be wearing jogging bottoms and a t-shirt. He may be in a confused state.
If you see him please call 101.