The interceptor is named the highway for transporting town's wastewater to Moa Level for cure. It's so critical that a spontaneous failure may have "catastrophic" health and fitness and environmental outcomes from uncontrolled discharge. The bridge was a 38.3m steel body truss with GEOTUB modular 900mm columns and 1200mm dia https://drainageinstallationscent07394.blogdon.net/drainage-installation-central-coast-an-overview-30287429