FAQs

Dynamic lanes use technology like overhead signals or lane barriers to change the direction of traffic during different times of day. We typically use them during peak traffic periods to give that traffic more lanes to move. We can also use them to create a temporary priority lane for buses or freight trucks to help them move better through peak traffic.

The Redoubt Road dynamic lane system works by creating two lanes for afternoon peak traffic coming from the Southern Motorway to move in instead of one. At all other times, the road returns to its normal setup of two lanes for traffic heading towards the Southern Motorway and one lane heading from the motorway. Overhead traffic signals show which lanes drivers should use. 

Dynamic lanes provide a flexible smart solution for managing traffic and congestion on busy roads. They help us get more use out roads when we need them most without having to widen them. Dynamic lane systems are also quick to build and more cost-effective than road widening.

Since they went live in 2020, the Redoubt Road dynamic lanes have helped reduce travel times for motorists driving at peak times by as much as 54%. 

The NZ Transport Agency Mill Road project is a Road of National Significance project to extend and widen the Mill Road corridor. When complete, this new 21.5km corridor will extend from Manukau to south of Drury through Alfriston, Takaanini and Papakura. Redoubt Road is included in the corridor project area. 

Currently, this project is still in investigation, with the first phase of construction potentially starting in mid-2026. We don't expect the Redoubt Road dynamic lanes to have any effect on the Mill Road corridor project. However, it is possible the dynamic lanes will not be needed after the project is completed.

You can learn more about the Mill Road project and follow its progress by going to the NZTA website.