Police have confirmed they are still enquiring into the circumstances which led to a man being found injured on the A52, at Benington, last week.
A police spokesman confirmed the 34-year-old was admitted to Pilgrim Hospital, in Boston, shortly after midnight on Friday after he was found on the road.
They are appealing to any witnesses who may have seen a pedestrian walking along the A52 from Boston towards Skegness on Thursday night into the early hours of Friday.
Anyone with information should contact Lincolnshire Police by dialling 101 and quoting incident number 7, of May 8, 2015.
Report crimes anonymously by contacting Crimestoppers on 0800 555 111.