Is the number of accidents caused by foreign drivers increasing? No. It has been fairly constant at around 6% of all accidents for the last decade.
In that time tourism numbers have increased 30%.
So would requiring tourists who are here more than three months to undertake a driving test make much of an impact. The data suggests next to nothing.
In 2016 there were 1,817,136 tourists here and only 40,336 stayed for more than three months. That's 2.2%.
So this measure would impact just 2.2% of tourists in NZ. If tourists cause 6% of all accidents then you might expect a 0.13% reduction in the road toll.
And that is only if you make the generous assumption that having them sit a NZ licence test will mean they are guaranteed to have no accidents.
So the proposal, while well intentioned, will achieve basically nothing.
Thanks to Kiwiblog for putting these numbers together.