A new practical driving test now in force will be much more challenging to pass than the previous test.
Learner drivers will have to clock up at least 120 hours of supervised practice before they can sit their exam.
The Transport Agency says the changes, which came into effect on Monday, are designed to improve safety.
The agency warns drivers they are unlikely to pass the new test unless they put in the required preparation.
Research has shown young drivers who complete 120 hours of supervised practice on their learner licence are significantly less likely to crash than those who have only 50 hours of experience.