Road safety operations will be carried out through the end of May and into June as part of "Operation Twistlock," a trans-Tasman road safety initiative focusing on heavy vehicles, according to a report in the New Zealand Herald.

Police and road safety agencies from Australia and New Zealand will focus on issues including vehicle safety, fatigue, speed, alcohol and drug use, according to the report.
The operation is an extension of the normal work carried out by the police commercial vehicle investigation unit, with particular focus on major roading corridors where there is the greatest concentration of heavy vehicles flowing through, according to the report.

One such area was Auckland, which had more trucks, buses and taxis than the rest of New Zealand combined. The Auckland operation would focus on trucks moving from Auckland's air and sea ports to inland ports, according to the report.