The government's plan to introduce a congestion charging scheme has hit a speed bump, with National not too keen on the idea.
The scheme would see commuters pay a fee for driving in heavy-traffic areas at set peak times.
Labour was hoping all political parties would be on-board before introducing a law.
National's Simeon Brown wrote to former Transport Minister Michael Wood in late May, saying National is opposed to the bill.
Simeon Brown spoke to Ingrid Hipkiss.
