NZ Transport Agency Waka Kotahi said the aim of the lights was to protect the bridge from the impact of heavy, modern vehicles by slowing them down on their approach to the bridge, which made them less damaging as they travelled across the structure.
Cameras have been installed on the bridge, relaying real-time footage back to the NZTA network controls team, who will monitor traffic flows and make adjustments, if needed.
The upgrade also makes it safer for motorists by managing the bridge’s single-lane flows.
The work aims to help extend the life of the historic bridge.