Thames Valley Police has issued a warning to drivers after a car was filmed in the outside lane for five miles.
The force said its unmarked bikers clocked the Mercedes on the M4 not following the rules of the road.
Officers pulled the driver over and gave them a ticket for being in the incorrect lane yesterday morning.
Posting on social media, drivers were given a reminder about ensuring safe motorway driving.
While on patrol on the #M4 this morning, one of our unmarked bikers observed this Mercedes travelling in the outside lane without moving back to the correct lane for over 5 miles.
The outside lane is to be used for overtaking slower vehicles in the nearside and middle lanes. Likewise, the middle lane is for overtaking slower vehicles in the nearside lane.
You should be driving in the leftmost available lane when not overtaking.
Unnecessarily remaining in an overtaking lane causes congestion, frustrates other drivers and demonstrates a lack of paying attention to your surroundings!
Ticket issued.