They:

• improve the overall performance of the transport system
• manage and account for the funds invested in transport
• monitor the performance of transport Crown entities
• lead the National Road Safety Committee, working towards safer roads, vehicles, drivers and speeds
• work with the Civil Aviation Authority and Aviation Security Service on air safety
• administer the contract with the Meteorological Service so they can provide weather forecasts and warnings
• represent New Zealand internationally in aviation and maritime issues.

They do not have a hands-on-role in daily traffic, aviation, rail or maritime matters.