The Driver and Vehicle Agency has only carried out around a fifth of the number of vehicle tests so far in 2020 compared to last year.
The agency's work has been hit hard by coronavirus rules.
In November, the DVA conducted over 22,600 full vehicle tests, an increase of 1,900 compared to October - but less than a third (31%) of the five-year average for the month prior to the pandemic.
So far in 2020, the DVA has conducted around 196,000 full vehicle tests, which is just 22% of the equivalent total in 2019 (905,000).
So far in 2020, the DVA has conducted over 19,300 driving tests - 36% of the equivalent total in 2019 (53,300).
Around 1,270 driving tests were complete in November, a decrease of 1,070 compared to October. This is 24% of the five-year November average before the pandemic, although over a shorter period due to lockdown restrictions.