There are warnings further restrictions on heavy vehicles might soon be needed.
The Transport and Infrastructure Committee spoke with NZTA's senior management about its 2019/20 annual review.
Gale force winds had forced the boat to circle the Marlborough Sounds for hours on Tuesday.
"They will eventually be caught and could be fined $150."
"90 in an open space?"
One in four companies had trucks parked up because there's no one to drive them.
Instead of hundreds of trucks having to use SH1, this time the cargo can use the upgraded railway.
The roads are likely to be busy later on, and there will be delays.
More than 2000 workers will be sweating it out across about 2500 sites nationwide.
