Mr Dangerfield said the new test had been specifically designed to improve safety by encouraging learner drivers to clock up at least 120 hours of supervised practice before sitting it.
"It's important that we remember what this new test is all about - reducing needless deaths and injuries on our roads, improving the standards of young and novice drivers and encouraging them to take the time to develop their skills and build a solid and a safe foundation before they move on the next stage of our licensing system. We are doing young people no favours with a 'once over lightly' approach."
For the next six weeks NZTA would waive the fee for cancelling or rescheduling tests for drivers who had already booked appointments if they decided they needed more time to prepare.
Road safety campaigner Clive Matthew-Wilson warned that the harder tests would inevitably result a rise in the number of unlicensed drivers.
"It's a mixed blessing because among the poor who generally can't afford practical driving instruction they tend to simply drive without drivers licences. Exactly the same thing happened when they toughened up on the warrant of fitness regulations - it simply meant that more people were driving without a warrant of fitness which is not a good thing.
"I applaud making drivers licences tougher to get but there has to be a taking with one hand and a giving with the other, in other words, drivers licence training needs to be made more widely available, especially for poor people and particularly for Maori, who are 3 times more likely to die on the roads."
NZTA spokesman Andy Knackstedt said this argument didn't hold water because the tougher tests didn't cost more.
Mr Knackstedt pointed to two websites designed specifically to help drivers pass: www.practice.co.nz and www.safeteendriver.co.nz