Cameras have been installed to help drivers avoid a holiday traffic bottleneck at the Kopu bridge, near Thames.
Eleven hundred vehicles per hour cross the old one-lane bridge at peak times to travel to the Coromandel and delays of over an hour can be expected.
The cameras will provide live-images which will be fed to the New Zealand Transport Agency's website.
The agency says the information will allow drivers to time their journeys depending on traffic volumes.
It says people can then decide whether to use the bridge or take the alternative route through Paeroa.
Peak times on the bridge are normally between Christmas and just after New Year.
A new double-lane bridge is expected to be complete by mid-2012.