Road User Charges are only required because diesel is largely tax free as far as road costs are concerned. This exemption is almost entirely intended for farmers who use diesel as a fuel on the farm and claim they don't use the roads. Well....the law does allow them to use the roads in an incidental way, to get from paddock to paddock, etc.
But the RUC regime ONLY exists because of this exemption. I think it should be done away with. Put the same tax on all diesel.
Farmers drive their tractors on the roads all the time....and for considerable distances....and often at peak times, obstructing other traffic by going very slowly.
Night before last I passed a tractor on the Eastern Link toll road, east of Tauranga. This road is 15km long and once on it you have to traverse the entire length of the road.......I assume this tractor paid a toll? But it's just the latest of many, tractors belonging to farm contractors who use the roads daily to get from farm to farm.