Limousines have been stopped and checked by police in Brighton to ensure companies are complying with the law and are fit to carry passengers.
Police said limousine use was rising, particularly in cities like Brighton, and firms had to follow safety and legal requirements at all times.
A spokesman said there were more than 6,000 limousines in the UK. Many are from the US where different laws apply.
The checks were carried out by Sussex Police and other agencies on Friday.
Other organisations involved in the exercise were VOSA, DVLA and Brighton and Hove City Council.
Earlier this year, the Department for Transport published guidelines for operators, and brought in a safety inspection regime.
The new guidelines were to help limousine owners make sure their vehicles comply with regulations on weight, dimensions, turning circle, seating, brakes, tyres, doors, lamps and reflectors and glazing..