The "Instant Mash situation" was caused by a lorry spilling a load of mashed potatoes that quickly "swelled up" and created perilous driving conditions that made the road as slick as an "ice rink."
NYP and Emergency Services colleagues dealing with SNOW In June ? On #A64...... No its instant mash potatoe causing significant road closure— NYP Control Room (@NYPControlRoom) June 21, 2014
"It was like a sea of white," a witness told the Daily Mail. "I was about a mile away from where it happened but I could still see it. At first I just didn't know what it was. I heard it was mash potato, but I am not sure whether it was mashed before or after the spillage."