A mannequin dressed as Prince Charming was believed to be a “body rolled up in a carpet” on a motorway outside Ely.
Concerned folks on the M11 motorway called local authorities after spotting the unusual sight in a car but on closer investigation, it was discovered to be a prop for a themed party.
A spokesperson for Cambridgeshire Police said: “"When we received a call on Saturday lunchtime to reports a vehicle was travelling along the M11 with a pair of feet poking out the end of a rolled up piece of carpet, alarm bells were naturally ringing for the informant and our control room.
"We managed to track the vehicle down in Angel Drove, Ely where our officers discovered there were indeed a pair of feet... belonging to a mannequin dressed as Prince Charming who was on his way to a themed birthday."
They also said that the driver was told to “avoid such circumstances again” and before adding they were thankful it was a “false alarm”.