A group of people tried to travel from Bristol to "look at the beach" in Tenby amid the coronavirus pandemic.
Pembrokeshire Roads Policing Unit tweeted on Friday (May 1): "Stop check in Pentlepoir on a vehicle, registered and insured to the Manchester area.
"Occupants stated they had just finished work in Bristol and were going to Tenby to ‘look at the beach’.
"Both reported re. non essential travel, vehicle turned around."
The picture shared by police showed the group had been stopped in a white Seat Leon at a Pentlepoir petrol station, more than 120 miles from Bristol.
Asked what happened afterwards, the force replied: "In a situation like this we’ll follow the vehicle to ensure that they leave the county."
It is not the first time day-trippers from Bristol have been warned not to visit Wales during lockdown.
A climbing party travelled from the city to Pen y Fan on March 28, receiving an immediate police direction to go home.
Pembrokeshire Roads Policing Unit tweeted about another incident on Friday, involving a vehicle from Bristol it stop-checked at Penblewin that afternoon.
"Checks on the driver showed him to be wanted on warrant for failing to appear at court in the Reading area," the tweet said.
"He was also subjected to a roadside drugswab which he failed, testing positive for cannabis.
"Blood samples taken accordingly at custody.
"The vehicle, which had an itinerary for over 20 separate deliveries today, has also been prohibited due to its condition.
"Despite its handbrake being applied and the reverse gear engaged, it was still rolling down the slight incline it had pulled over on."
The force said the suspect had been released under investigation, adding: "The deliveries had already been completed."
Lockdown rules mean people can only go outside if there is a "reasonable excuse", such as shopping for essential items, providing medical help or for exercise.
People have been told to stay close to their home.