A couple travelling to Cardiff to deliver Christmas presents to relatives were stopped by police for breaking coronavirus laws.
South Wales Police pulled over the pair, who had driven from Essex, after they were issued with powers to randomly stop and fine drivers from 9am on Friday.
The operation aims to stop people from outside Wales from travelling into the country this weekend.
South Wales Police said they stopped 110 vehicles in the first 24 hours of the random checks in the Welsh capital.
A total of 12 people were fined and 15 others were warned and asked to leave Cardiff on Friday.
The couple who were stopped had driven around 200 miles to deliver the presents despite being banned from doing so as England is still in a lockdown until Wednesday.
The force did not comment on whether the pair were fine, The Sun reports.
Other vehicles turned away include a convoy of nine people who were travelling to visit friends at university.
There are no travel restrictions in place in Wales but people in England are banned from crossing the border without a “reasonable excuse”.
The Welsh government drew up a list of “restricted list of essential purposes” which includes travelling for work and a journeys needed on "compassionate grounds".
Wales ended its “firebreak” lockdown ended on November 9 which allowed pubs, restaurants and non-essential retailers to reopen providing social distancing measures are in place.
South Wales Police were granted the temporary extra powers after concerns were raised that people from locked-down areas of the UK travelled to Cardiff last weekend.
The random checks will continue until 5pm on Sunday.
Superintendent Wendy Gunney said: "I would like to thank the vast majority of people who are enjoying their weekend with caution and within the confines of the existing regulations, but those not adhering to the rules are continuing to put others at increased risk.
"The measures which are in place are in place for a reason. Our checks will continue throughout the weekend, and anybody blatantly flouting the rules, which have been made very clear, face being fined."
Under the coronavirus fixed penalty notice system police can fine offenders £60 for a first offence, this rises to £120 for a second offence and continues to double for repeated offences up to a maximum of £1,920, .
If an offender is hauled before the courts they could be slapped with an unlimited fine.
