The transport sector currently produces 47 percent of New Zealand's CO2 emissions.
Freight rail will now be funded from the same pot as roads.
An old wooden bridge that carries masses of the country's potatoes and carrots is jeopardising truckers' safety and farmers' livelihoods.
NZ Bus hasn't said how long the lockout will last.
"Starting your trip at non-peak times can make the journey safer, easier and more enjoyable."
Tramways Union members voted last week to strike after a breakdown in pay negotiations.
Transport Minister Michael Wood said the planning, governance and oversight of the project was clearly lacking.
The stretch of motorway was supposed to cost $850 million but has now exceeded a budget of $1.25 billion.
"It's looking like word has got out, well and truly."