THE Land Transport Authority has deregistered 19 vehicles around the country so far this year while 58 have been impounded.
Apart from this, 39 drivers have been issued warning letters for various offences.
LTA spokesman Iliesa Sokia warned vehicle operators that it was illegal to operate a private vehicle without authorisation and certification.
Responding to concerns raised by taxi operators in Taveuni regarding the numerous illegal operators on the island, Mr Sokia said the LTA would crackdown on illegal operators and take them to task.
Naqara resident Rafiq Khan said there were a lot of illegal operators on the island.
"It is not funny since these illegal operators are robbing money from legal operators who have gone through the processes and paid money to ensure that they register their vehicles for hire purposes," he said.
"The illegal operators are so bold and operate in the open. They are affecting the income of legal operators."
However, Mr Sokia said the authority would not hesitate to deregister more vehicles if private motorists were found operating illegally.
"This is a measure we have taken. After a thorough investigation and after exhausting all disciplinary avenues, we decided to deregister the 19 vehicles.
"This is the extent we will take in order to protect the interest of stakeholders and legal operators who have been robbed of valuable income by the illegal operators.
"LTA wants to make it very clear that it's illegal to operate a private vehicle without the authorisation and certification by the LTA and we are warning private vehicle owners because we will get them."