Police have tweeted photos of what looks like a driver in the outside lane of the M5 with their feet up on the dashboard.
The tweet, from Devon and Cornwall Police and Dorset Police Roads Policing Team account, was posted on Tuesday 12 March.
The officer who posted it said:
The pick-up truck was snapped in the outside lane of the motorway, with two feet clearly visible on the dashboard of the driver's side.
It attracted several responses on social media, including one from another local police officer.
PC Phil Skedgell said: "Utterly stupid and dangerous. On which planet would / could this be considered appropriate?"
Devon and Cornwall Police has been contacted for more information.