The crash was reported to police at 6:40am.
"There are an awful lot of people who are using our roads and not paying for it."
They died in a two-vehicle crash on State Highway 1.
The major route is now closed between Ward and Kekerengū.
Two of the injured people were airlifted to Wellington Hospital.
They will be tested on emergency procedures if a train derails.
The crash happened on Friday evening.
Police said they did not believe there was an ongoing risk to the public.
It's understood the spill is at the ferry terminal.
