Mechanics from Spain and the Philippines are being transferred to Ireland to try to clear NCT delays.
The Road Safety Authority says drivers are waiting an average of nearly 25 days to get an appointment, up from less than 12 days in 2020.
Covid and staff shortages are being blamed, with some motorists experiencing delays of nearly 6 months for the test.
The Road Safety Authority is before the Oireachtas Transport Committee today to answer questions on the backlog.
Committee chairman, TD Kieran O'Donnell, says drivers are worried about breaking the law.
