It is saying it is dedicating all fuel tax, road user charges (RUC) and motor vehicle registration (MVR) fees to land transport, when the latter two were fully dedicated before Labour was elected. Oh and the fuel tax dedication came after National campaigned on it in 2005.
The NZ$19.4 billion is over 6 years, a good 35-40% of that will be for road maintenance - so business as usual. The rest is divided between public transport and new road construction.
However it ISN'T news. The money is already being collected from road users, the only issue is how that is allocated. Presumably National would spend the same.