I've done a fair bit of digging on this subject. There are numerous references to advice received directly from Police that there is a minimum 80k limit on motorways. However, trawling through the
Land Transport (Road User) Rule 2004 and subsequent amendments I can't find any reference to an 80k minimum. The best I can surmise is that 80k is used by Police as a guideline to decide whether or not to pull someone up to find out whether they are justified in travelling slow. This would be akin to the 20k discretion they generally exercise with bikes lane splitting.
While there is no mention of discouraging learners from using main roads, the stated objective of the Land Transport (Driver Licensing) Rule 1999 includes this.
"These changes are aimed, in particular, at reducing the exposure of young drivers ... to road crashes; ..."
Given that there are fewer accidents per km travelled on motorways than on other roads and that the majority of motorcycle accidents occur at intersections (off the motorway), then I think the reasons for discouraging motorway use are flawed.
There is also suggestion in various forums that the 70k restriction may be scrapped on the grounds that it is dangerous. The Road User Amendment (Rule 61002/2) is in progress but I'm not confident that scrapping the 70k limit is included. The amendment is intended to implement the findings of the Road Safety Strategy 2010. There were heaps of submissions on speed, particularly what the open road limit should be, but I can't find any reference to the limit imposed on 6L/6R riders. Perhaps it got in though common sense ... yeah right! I'm not holding my breath.
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