National's main line of attack in the debating chamber was listing the regions which would lose key transport projects. One by one, National MPs from the Bay of Plenty, Taupo, and mid-Canterbury said their constituents would be paying more for petrol only to see that money spent in the city centres.
Ardern countered by saying that National's planned highways would only benefit 4 per cent of all road users, far fewer than Labour's proposed initiatives. Labour would also be lifting spending on local roads and maintenance of existing highways.
Policy documents show that Labour's transport plan for the next 10 years will cost $4.6b a year, $650 million more than National's 10-year plan.
The higher cost will be covered by petrol tax increases of 3 to 4 per cent a year. Once the Auckland Council's regional fuel increase is added, some Auckland commuters will be paying up to 22 cents more a litre.
Defending the tax increases yesterday, Transport Minister Phil Twyford said the new costs were equivalent to a cup of coffee a week and would pay for "some pretty amazing investments in the transport system".
He conceded that some motorists in the Auckland region would get no direct benefit for their higher costs at the pump, but they were likely to benefit from the council's transport plans.
Labour's funding for state highways is nearly equivalent to what National promised over the next three years, because it will complete large highways which were already underway.
After three years, funding for highways drops off significantly, from $1.1b in 2021 to $500m in 2028. Nine highways promised by National during the election, including four-laning between Auckland and Whangarei, will no longer go ahead.
Twyford said this money would instead be redirected into public transport, local and regional roading, maintenance of existing highways and road safety measures.
What they promised (next 3 years)
Public transport
National: $1.35b
Labour: $1.78b
State highway improvements (includes new highways)
National: $4.6b
Labour: $3.85b
Local road improvements
National: $455m
Labour: $1b
Regional improvements
National: $425m
Labour: $530m
State highway maintenance
National: $1.98b
Labour: $2.1b
Local road maintenance
National: $1.9b
Labour: $2.1b
Road policing
National: $1b
Labour: $1.1b
Walking and cycling improvements
National: $195m
Labour: $360m